Statistics question and answers for August 08, 2023
- Q Find an example of use of a) cluster analysis and b)classification in research or business literature. Preferably,those example should be taken from the same domain. Analyze theproblems that were solved...
- Q A recent report in Woman’s World magazine suggestedthat the typical family of four with an intermediate budget spendsabout $106 per week on food. The following frequency distributionwas included in the...
- Q In what follows use any of the following tests/procedures:Regression, confidence intervals, one-sided t-test, or two-sidedt-test. All the procedures should be done with 5% P-value or 95%confidence interval.Use the Brains data....
- Q The Toylot company makes an electric train with a motor that itclaims will draw an average of only 0.8 ampere (A) under a normalload. A sample of nine motors was...
- Q A study determined 35% of Millennials in America have no creditcard debt. By assuming p = .35 is asuccess (no debt), if a random sample of 50 millennials wasselected, find...
- Q Provide an example ofWhat happens to the confidence interval if you (a) increase theconfidence level, (b) increase the sample size, or (c) increase themargin of error? Only consider one of...
- Q In the 2008 General Social Survey, incomes of marriedrespondents were classified as above average, average, and belowaverage. Respondents also answered a question about maritalhappiness as not happy, pretty happy, or...
- Q A researcher interested in the working habits ofstudents at RCC randomly selects 300 students andfinds that 23% have a full time job.(a) Did the study use population or sample data?Explain.(b)...
- Q Refer to the accompanying data display that resultsfrom a sample of airport data speeds in mbps.complete parts (a)through (c) below .T INTERVAL (13.046,22.15)_x=17.598sx=16.01712719n=50a.express the confidence interval in the format thatuses...
- Q Suppose that a sample of 15 women had a mean heart rate of 73.93and a sample standard deviation of 8.42. Assume that thedistribution of women’s heart rates is normal. Use...
- Q Can hair length be used to predict the height of a person? Totry to answer this, the following random subset of data werecollected from our class’s data:Hair length:      8       12       18       24       1       4         24       2                                          Height:          68     60       61       67       67       70       68       ...
- Q A random sample of 49 colleges yielded a mean cost of collegeeducation of $30,500 per year. Assume that the population standarddeviation is $3000 and college costs are normally distributed.a.) Calculate...
- Q #14) A researcher collected data on the eating habits of 64Americans in 2018 and finds that they eat an average of 125 lbs ofcheese per year with a sample standard...
- Q Protein content in a particular farmer’s soybean crop isnormally distributed with a mean of 40 grams and a standarddeviation of 20 grams. Suppose we take samples of size 100 soyplants....
- Q 1-A manager of an e-commerce company would like to determineaverage delivery time of the products. A sample of 25 customers istaken. The average delivery time in the sample was four...
- Q The ability to find a job after graduation is very important toGSU students as it is to the students at most colleges anduniversities.Suppose we take a poll (random sample) of...
- Q The urinary fluoride concentration (parts per million) wasmeasured both for a sample of livestock grazing in an areapreviously exposed to fluoride pollution and for a similar samplegrazing in an unpolluted...
- Q Confirmed Cases, X Hospitalizations, Y 2605 482 1833 334 1532321 1474 283 1465 431 1062 154 643 113 626 115 456 54 384 71 373108 362 87 329 61 302...
- Q The average life of a certain type of motor is 10 years with astandard deviation of 2 years. You are interested in measuring thelife time of this motor by conducting...
- Q Birth weight and gestational age. The ChildHealth and Development Studies considered pregnancies among womenin the San Francisco East Bay area. Researchers took a randomsample of 50 pregnancies and used statistical...
- Q A survey of 25 randomly selected customers found the ages shown​(in years). The mean is 31.96 years and the standard deviation is10.12 years.​a) Construct a 95​% confidence interval for the...
- Q Zagat restaurant guides publish ratings of restaurants for manylarge cities around the world. The restaurants are rated on a 0 to30 point scale based on quality of food, decor, service,...
- Q Discuss most suitable research strategies to beused
- Q Ian is testing to see if Irvinites eat more fruits andvegetables than the average American. Previous research indicatesthat Irvinites eat 5.8 servings per day. The national average is4.6 with a...
- Q Consider the following Two-(Independent) Sample setting: Afarmer who own 200 cows wants to compare two different feeds 1 and2. The farmer first did simple random selection of 11 cows from...
- Q Best seller books the meaning for the number of weeks 15 bestseller list 22 weeks the standard deviation is 6.17 weeks themeaning for the number of weeks 15 New York...
- Q College Graduation Rates. Data from the CollegeResults Online website compared the 2011 graduation rate and medianSAT score for 92 similar-sized public universities and colleges inthe United States. The scatterplot below...
- Q In San Francisco, a sample of 3,284 wireless routers showed that1,182 used encryption (to prevent hackers from interceptinginformation). In Seattle, a sample of 1,900 wireless routers showedthat 630 used encryption.(a)...
- Q Interpret the meaning of the significant main effect(s) andinteraction(s) – what do they mean or what do they tell you?
- Q A shady broker offers a dubious investment opportunity. In week0, he sells a $11,000 note promising to repay $11,500 in one week.In week 1, he sells two such notes and...
- Q Given a standard normal distribution, find the area under thecurve whichlies(i) to the left of z = 1.43;(ii) to the right of z = -0.89;(iii) between z = -2.16 and...
- Q A person has $20,000 to invest in four possible opportunities.Each opportunity will accept investments in $1,000 units, but onlyafter the required minimum investment has been made.The minimumsare $2, $2, $3...
- Q Suppose every 10 times you cast your line into a lake yousuccessfully get 3 fish. Assume you cast your line 100 times.a) What is the probability of successfully catching exactly...
- Q A simple random sample of size n is drawn from a population thatis normally distributed. The sample​ mean, x overbar​, is found tobe 109​, and the sample standard​ deviation, s,...
- Q 1. If the normality assumption is met, but the equal varianceassumption is not met, what alternative analysis could be used inplace of the traditional F test for a one-way ANOVA...
- Q How effective is gastric bypass surgery in maintaining weightloss in extremely obese people? A study conducted found that 71% ofan SRS of 437 subjects who had received gastric bypass surgerymaintained...
- Q 4. Replacement times for TV sets are normally distributed with amean of 8.2 years and a standard deviation of 1.1 years. (Changethe final answer to a % and keep 2...
- Q Ex. A group of research scientists collect 2000 water samplesfrom drinking water in Central Arizona. They test those samples fora certain chemical. The test isn’t 100% accurate. If the samplecontains...
- Q The mean yearly snowfall for Boston over the past century is43.5 inches. The standard deviation for this data is 19.4. Assumethat the snowfall amounts are approximately normally distributed.If a random...
- Q 10.4 Comparing two means: Paired samples\"We want to know if there is a difference between the size of theshoe between mother and daughter, for which a sample of 10 pairs...
- Q Consider the two processes below with specifications 100 plus orminus 10:Process A: mean of 100, standard deviation of 3Process B: mean of 105, standard deviation of 1n=5 for both processesa.)...
- Q An urn contains 5 green balls and 8 red balls. One of theballs is drawn at random.The drawn ball is returned to the urn with 3 additional ballsof the same...
- Q A survey of 85 people in Kansas City gave the followingresults:33 were fans of the Kansas City Chiefs43 were fans of the Kansas City Royals46 were fans of the Sporting...
- Q 4. the researcher wishes to usenumerical descriptive measures to summarize the data on each of thetwo variables: hours worked per week and incomeearned per year.Prepare and display a numerical summary...
- Q 1) A student wishes to determine the association between HoursStudied and Test Score. She also wants to determine the associationbetween Hours of Sleep before the Test and the Test Score.Hours...
- Q The dean of the a school has observed for several years andfound that the probability distribution of the salary of thealumni’s first job after graduation is normal. The collegecollected information...
- Q It is thought that 12% of all students taking a particularcourse received a grade of A. In a sample of 155 students, it isfound that 21 made an A. can...
- Q 1. The Kenton Food company wished to test four different packagedesigns for a new breakfast cereal. Twenty stores, withapproximately equal sales volumes, were selected as theexperimental units. each store was...
- Q (a) Show that the sample variance s 2 = [Pn i=1(xi − x¯) 2 ]/(n− 1) can also be expressed as s 2 = [Pn i=1 x 2 i −...
- Q A license plate in a certain state consists of 4 digits, notnecessarily distinct, and 3 letters, also not necessarilydistinct.(a) How many distinct license plates are possible if norestriction?(b) How many...
- Q The population mean and standard deviation are given below. Findthe required probability and determine whether the given samplemean would be considered unusual.For a sample ofn=70find the probability of a sample...
- Q A sample has a mean of M = 60 and a t statistic of t = 4.5. Fora one-tailed hypothesis test with α = .01, what is thecorrect statistical decision...
- Q Maximize p = 14x + 10y + 12zsubject tox+y−z≤3x+2y+z≤8x+y≤5x ≥ 0, y ≥ 0, z ≥ 0P=(x,y,z)=
- Q Game_NumberWinnerLoserDuration1JensSven412SvenJens763SvenJens1564SvenJens1515SvenJens1056JensSven717SvenJens1238SvenJens1119SvenJens16410SvenJens11611JensSven4612SvenJens8813JensSven5914JensSven4715JensSven5716SvenJens10817SvenJens7818SvenJens9419JensSven8620JensSven6021JensSven5222JensSven6423JensSven7224JensSven5625JensSven3026SvenJens17327JensSven4628JensSven8029SvenJens14730JensSven8731JensSven7132SvenJens14633SvenJens6634JensSven6235JensSven5936SvenJens17337JensSven7338JensSven7539SvenJens14840JensSven7341SvenJens12742SvenJens10843JensSven3244JensSven6145JensSven8946JensSven3447JensSven5048JensSven6249SvenJens12850SvenJens7351SvenJens11252SvenJens12553SvenJens6554SvenJens14155SvenJens10456Sven Jens12357JensSven8658JensSven4959SvenJens14460SvenJens10361JensSven8162SvenJens6563JensSven7764JensSven6465SvenJens16266SvenJens15567SvenJens6768SvenJens9169JensSven6770SvenJens13771JensSven8272JensSven8673SvenJens10274SvenJens10175SvenJens16476JensSven3177SvenJens8378SvenJens17379SvenJens12580JensSven4981SvenJens12582SvenJens11583JensSven7984JensSven6485SvenJens17786SvenJens12487JensSven8388SvenJens16289SvenJens10490SvenJens13591SvenJens17992JensSven8893JensSven7294SvenJens6695SvenJens11996SvenJens17797JensSven7398SvenJens13799SvenJens99100SvenJens1591. Construct two QQâ€plots, one displaying the durations of the games Sven won, and another displaying the durations of the games Jens won. (Note: When making the QQâ€...
- Q A political analyst was curious if younger adults were becomingmore conservative. He decided to see if the mean age of registeredRepublicans was lower than that of registered Democrats. Heselected an...
- Q The following data are given for a two-factor ANOVA with twotreatments and three blocks.  TreatmentBlock12A4331B3322C4636  Using the 0.05 significance level conduct a test of hypothesisto determine whether the block or the treatment...
- Q According to the National Health Statistics Reports, thestandard deviation of the weights of all one-year-old baby boysborn in the U.S. is 5.3 pounds. A random sample of 360 one-year-oldbaby boys...
- Q In a survey of 517 music teachers, 403 said that the video gamesGuitar Hero and Rock Band have a positive effect on musiceducation. Construct a 98% confidence interval for the...
- Q A social science researcher collected data from a randomsample of 400 students at a large university and found that, onaverage, they belonged to 2.6 campus organizations. The standarddeviation σ for...
- Q A psychic was tested for ESP. The psychic was presented with 400cards face down and was asked to determine if the card was one offour symbols: a cross, a star,...
- Q High School A and High School B both claim that they aresuperior. Last year School A had 354 students take an AP exam and231 passed. School B had 684 students...
- Q Following are the number of grams of carbohydrates in a sampleof 12-ounce espresso beverages offered at Starbucks.6, 7, 19 , 20, 22, 25, 27, 38 , 48, 59Compute the IQR....
- Q \"To Breakfast or Not to Breakfast?\" by Richard AyoreIn the American society, birthdays are one of those days thateveryone looks forward to. People of different ages and peer groupsgather to...
- Q A multiple-choice test question has four possible responses. The questionis designed to be verydifficult, with none of the four responses being obviouslywrong, yet with only one correctanswer. It first occurs...
- Q An Izod Impact Test was performed on 20 specimens of PVC pipe.The sample mean is ? = 1.25, and the sample ??? ??????? ? standarddeviation is ? = 0.25. You...
- Q In studying his campaign plans, Mr. Singleton wishes to estimatethe difference between men's and women's views regarding his appealas a candidate. He asks his campaign manager to take two randomindependent...
- Q In a study of smoking and its effects on sleep patterns, onevariable is the time that it takes to fall asleep. A random sampleof size 12 is drawn from the...
- Q A poll found that of 79 registered voters under 45 years of age,18 favored a particular candidate. Of 65 registered voters aged atleast 45 years old, 15 favored the same...
- Q In your attempt to “catch them all†you hunt the prized Pokemon,Mew and Mewtwo. As you battle them with your top 25 Pokemon, youlose every battle. However, after each battle,...
- Q The following three independent random samples are obtained fromthree normally distributed populations with equal variance. Thedependent variable is starting hourly wage, and the groups are thetypes of position (internship, co-op,...
- Q The 2011 National Health Interview Survey by the National Centerfor Health Statistics (NCHS) provides weight categorization foradults 1818 years and older based on their body mass index.The same NCHS report...
- Q Given a random sample of size 16 from a normally distributedpopulation with a mean of 100 and standard deviation of 24, findP(x bar≤90)
- Q USING R ---locate the pre-loaded MASS package, then load thedata frame cats within that packag. This provides data on sex, bodyweight (in kgs), and heart weight (in grams) for 144...
- Q Suppose your favorite coffee machine offers 7 ounce cups ofcoffee. The actual amount of coffee put in the cup by the machinevaries according to a normal​ distribution, with mean equal...
- Q A study explored the effect of ethanol on sleep time. Fifteenrats were randomized to one of three treatments. Treatment 1 waswater (control). Treatment 2 was 1g of ethanol per kg...
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