Statistics question and answers for January 17, 2024
- Q Let y represent the profit or loss for a certain company years after 1980 Based on the data shown below a statistician calculates a linear model 1 03x 13 16...
- Q Plot the points in the grid below x axis for the First Quiz y axis for the Second Quiz 50 48 46 44 42 40 38 36 34 32 30...
- Q y 20 20 25 30 30 30 30 40 a What is the equation for the line of best fit
- Q The weight of a newborn animal is given by the formula W 6d 4 where W is the weight in grams and d is the number of days since hatching...
- Q Linear Regression Christmas Trees The following table gives the total number of live Christmas trees sold in millions in the United States from 2004 to 2011 Source Statista com 2...
- Q The TLK cell phone company has a basic cell phone plan This plan includes unlimited talk and text but charges a monthly phone charge fee of 29 00 per month...
- Q You are researching the growth of a species of fish You gather a sample of fish and record the age in weeks of each fish and its mass in grams...
- Q vent A Age 12 12 to 15 16 to 24 25 to 64 65 Totals Event B Vaccinated Not Vaccinated 124 873 47 793 946 6 424 266 10 214...
- Q This morning I stopped at Dunkin Donuts for a coffee They sell coffee in small medium large and extra large There are four kinds of coffee They also offer 7...
- Q You are performing a two tailed test with test statistic z 2 77 find the p value to 4 decimal places
- Q Suppose the results indicate that the null hypothesis should not be rejected thus it is possible that a type II error has been committed Given the type of error made...
- Q The p value for a hypothesis test turns out to be 0 034895 At a 6 level of significance what is the proper decision O Fail to reject Ho Reject...
- Q You are performing a hypothesis test of a single population mean using a Student s t distribution The data are not from a simple random sample Can you accurately perform...
- Q The IQ test is constructed so that Full Scale IQ scores follow a normal distribution with a mean of 100 and a standard deviation of 15 The dean of a...
- Q went A Age 12 12 to 15 16 to 24 25 to 64 65 Totals Event B Vaccinated Not Vaccinated 124 873 47 793 946 6 424 266 10 214...
- Q More than 82 of workers got their job through networking Express the null and alternative hypotheses in symbolic form for this claim Ho p HA P
- Q Event A Age 12 12 to 15 16 to 24 25 to 64 65 Event B Vaccinated 124 873 6 424 266 17 950 590 100 514 773 42 397...
- Q Suppose that a recent article stated that the mean time spent in jail by a first time convicted burglar is 3 7 years A study was then done to see...
- Q ou are performing a right tailed test with test statistic z 3 09 find the p value to 4 decima places
- Q You are performing a left tailed test with test statistic z 2 6 find the p value accurate to 4 decimal places p value
- Q Question You Are Considering Buying An Industrial Equipment Whose Price 260000 The You are considering buying an industrial equipment whose price 260000 The equipment is expected to earn an annual...
- Q At most 79 of Internet users pay bills online Express the null and alternative hypotheses ir symbolic form for this claim Ho p O II
- Q A commonly cited work week hours for an employee is 36 hours A company samples 200 employees and find an average work week hours of 47 hours with a standard...
- Q 3x 3x The area of the unshaded region in the square above i 3x y 3x y O 9x y2 O 3x 3x y y 3x y O 3x 3x...
- Q A Which of the following could be an equation of the line graphed in the xy plane ab 0y 1 x 1 0y x 1 Oy 2x 1 Oy 2x...
- Q A survey of working adults is described in an online article The article states Workers with a college education had a significantly increased chance of getting a pay raise in...
- Q Of x 1 x 1 Of x x 1 S i 3 7 4 Some values of the function f x are shown above Which of the following could be...
- Q What impact does fast food consumption have on various dietary and health characteristics A research article reported the accompanying summary statistics on daily calorie intake in calories per day for...
- Q a 95 large sample confidence interval for the proportion of college graduates who experience information overload Hint This is a one sample confidence interval Enter your answer using interval notation...
- Q Yes O No parts a and b overlap What does this suggest about the two population proportions This suggests that the two population proportions might be the same O This...
- Q Participants in independent representative samples of teens and parents of teens were asked if they check their phone for messages as soon as they wake up Of the 750 teens...
- Q Many people now turn to the Internet to get information on health related topics A research article used Flesch reading ease scores a measure of reading difficulty based on factors...
- Q A research article reported that for a random sample of 850 meal purchases made at fast food chain A the mean sodium content was 1 682 mg and the standard...
- Q Many people believe that they experience information overload in today s digital world A report describes a survey in which people were asked if they feel overloaded by information Suppose...
- Q Do children diagnosed with attention deficit hyperactivity disorder ADHD have smaller brains than children without this condition This question was the topic of a research study Brain scans were completed...
- Q What impact does fast food consumption have on various dietary and health characteristics A research article reported the accompanying summary statistics on daily calorie intake in calories per day for...
- Q The authors of a certain paper describe a study to evaluate the effect of mobile phone use by taxi drivers in Greece Fifty taxi drivers drove in a driving simulator...
- Q When the tissue around teeth becomes inflamed the tissue bleeds more easily and this is an indication of gum disease The severity of bleeding can be measured by a bleeding...
- Q Do children diagnosed with attention deficit hyperactivity disorder ADHD have smaller brains than children without this condition This question was the topic of a research study Brain scans were completed...
- Q The author of the article wanted to know if these data support the claim that students who participated in the chess program tend to achieve higher memory scores after completion...
- Q In a study of memory recall 8 students from a large psychology class were selected at random and given 10 minutes to memorize a list of 20 nonsensical words Each...
- Q A study investigated whether price affects people s judgment Twenty people each tasted six cabernet sauvignon wines and rated how they liked them on a scale of 1 to 6...
- Q PREVIOUS ANSWERS hr The authors of a paper were interested in estimating the mean time that patients who broke a hip had to wait for surgery before and after the...
- Q Suppose an article states People ages 35 to 54 were the least likely group to report buckling up in the back seat Seventy four percent of this group reported always...
- Q To determine if chocolate milk is as effective as other carbohydrate replacement drinks 10 trained cyclists performed an intense workout followed by a drink and a rest period At the...
- Q The National Sleep Foundation surveyed representative samples of adults in six different countries to ask questions about sleeping habits t Each person in a representative sample of 250 adults in...
- Q A manufacturer of college textbooks is interested in estimating the strength of the bindings produced by a particular Dindi ing force required to pull the pages of a book from...
- Q eight specimens and the resulting mean and standard deviation were 306 01 newtons and 41 91 newtons respectively Assuming that it is reasonable to believe that breaking force Tee replacements...
- Q A government agency reported that in 2020 6 0 of people with a bachelor s degree and 9 5 of people with a high school diploma but no college were...
- Q A student organization uses the proceeds from a soft drink vending machine to finance its activities The price per can was 0 75 for a long time and the mean...
- Q A report on food science states that younger adults are more likely to see foods with genetically modified ingredients as being bad for their health than older adults This statement...
- Q H A report about how American college students manage their finances includes data from a survey of college students Each person in a representative sample of 793 college students was...
- Q A report summarizes a survey of people in two independent random samples One sample consisted of 600 young adults age 19 to 35 and the other sample consisted of 200...
- Q Suppose that in studies of mobile phone use while driving conducted in 2015 and 2020 3 2 of the drivers observed in 2015 and 2 6 of the drivers observed...
- Q KSTAT3 11 1 010 S USE SALT Many people believe that they experience information overload in today s digital world A report describes a survey in which people were asked...
- Q Solve for y y YA Y A 4 V 192 13 192 13 12 13
- Q Solve for b 136 169 Ob 13 Ob 13 13
- Q The gross daily sales at a certain restaurant are a normal random variable with mean 2200 and standard deviation 210 What is the probability that a the total gross sales...
- Q What changes the width of a confidence interval A marketing director wants a 95 confidence interval for the mean cost of running shoes She randomly samples 40 pairs of shoes...
- Q A student was asked to find a 98 confidence interval for widget width using data from a random sample of size n 23 Which of the following is a correct...
- Q Researchers observed 50 random people brush their teeth and recorded the number of seconds each person spent brushing From the sample they found a mean time of 48 seconds Further...
- Q If n 120 and p 0 65 construct a 99 confidence interval Give your answers to three decimals p From ev
- Q Suppose X and Y are independent normal random variables with mean 11 and variance 4 Find x such that PX Y x PX 17 X Simplify your answer Type an...
- Q Assume that a sample is used to estimate a population proportion p Find the margin of error M E that corresponds to a sample of size 226 with 45 1...
- Q The random variables X and Y have the following joint density function 3 f x y xy 3 x 0 x 2 0 y 1 and equal to 0 otherwise...
- Q Let f x y 2xy where 0 x 2 0 sy 2 0 x y 2 and let it equal 0 otherwise a Show that f x y is a...
- Q Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car They randomly survey 410 drivers and find that 309 claim...
- Q You measure 48 dogs weights and find they have a mean weight of 42 ounces Assume the population standard deviation is 2 8 ounces Based on this construct a 90...
- Q Express the confidence interval 88 6 8 3 in interval form
- Q We wish to estimate what percent of adult residents in a certain county are parents Out of 100 adult residents sampled 11 had kids Based on this construct a 99...
- Q The accompanying table gives the joint probability mass function for X and Y a Find E X and E Y b Find Var X and Var Y c Find Cov...
- Q If X X2 X3 and X4 are pairwise uncorrelated random variables each having mean 1 and variance 1 comp the correlations of a X X and X X3 b X...
- Q There are 4 different types of coupons the first 2 of which comprise one group and the second 2 another group Eac 1 H Find the expected number of 10...
- Q The number of accidents that a person has in a given year is a Poisson random variable with mean However suppose that the value of changes from person to person...
- Q For a group of 140 people compute a the expected number of days of the year that are birthdays of exactly 2 people b the expected number of distinct birthdays...
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