Basic Math question and answers for September 03, 2024
- Q A quiz consists of 50 multiple choice questions, each with five possible answers, only one of which is correct. Find the mean and the standard deviation of the number ofcorrect...
- Q In a prior sample of U.S. adults, the Center for Disease Control (CDC), found that 8% of the people in this sample had pinworm but the margin of error for...
- Q A recent public opinion poll on gun control found that 84 people interviewed out of the 192 interviews supported new gun regulations.(a) What is the point estimate for the above...
- Q In a prior sample of corn, farmer Carl finds that 14% of the sample has worms but the margin of error for his population estimate was too large. He wants...
- Q Refer to a standard deck of playing cards. If you are unfamiliar with playing cards, see the description.During a game of Blackjack, three players are dealt four cards each, and...
- Q About 24% of flights departing from New York's John F. Kennedy International Airport were delayed In 2009. Assuming that the chance of a flight being delayed has stayed constant at...
- Q Find the area under the standard normal curve between z = -1.5 and z = 2.5.0.63120.71820.98310.9270
- Q Reading proficiency: An educator wants to construct a 99% confidence interval for the proportion of elementary school children in Colorado who are proficient in reading.Part 1 of 3(a) The results...
- Q Find the sum of the areas under the standard normal curve to the left of z = -1.25 and to the right of z=1.25.0.21120.78880.10560.3944
- Q Assume that the random variable X is normally distributed, with mean ? = 80 and standard deviation = 8. Compute the probability P(X <90).0.10560.88490.89440.9015
- Q According to a New York Times/CBS poll, 47% agreed that Social Security taxes should be raised if necessary to keep the system afloat, and 36% agreed that it would be...
- Q The dean of a college wants to use the mean of a random sample to estimate the average time students take to get from one class to the next. She...
- Q Provide an appropriate response.Many firms use on-the-job training to teach their employees new software. Suppose youwork in the personnel department of a firm that just finished training a group of...
- Q Small sample: Ninteen concrete blocks were sampled and tested for crushing strength in order to estimate the proportion that were sufficiently strong for a certain application. Seventeen of the 19...
- Q Determine whether the given description corresponds to an observational study or an experiment.In a study of 368 children with a particular disease, the subjects were asked to complete a survey...
- Q You are helping to plan an awards banquet for your school, and you need to rent tables to seat 180 people. Tables come in two sizes. Small tables seat 4...
- Q A statistics student gathered data on a large numbers of cars of a particular model, from new cars to those that were up to 10 years old. Using the data...
- Q Samantha invested $2000 at 11 % to be compounded monthly. What will be the value of Samantha's investment in 3 years? Round your answer to the nearest cent, if necessary....
- Q Problem Number Twelve: Suppose that weights of males in my family are N(250,24) where 250 and 24 are in pounds. I weigh 230 pounds. The percentage of males in my...
- Q Assume Z is a random variable with a standard normal distribution and d is a positive number. IfP(Z > d) = 0.15, then P(-d<Z<d) = 0.7.TrueFalse
- Q If a savings account of $8300 is compounded semi-annually at 12.49 % annual interest, how much will the account be worth in 52 months? Round your answer to the nearest...
- Q A student was studying the relationship between how much money students spend on food and on entertainment per week. Based on a sample size of 270, he calculated a correlation...
- Q The distribution of the top 1% of individual incomes in the US is strongly skewed to the right. In 1997, the two measures of center for the top 1% of...
- Q Find the critical value, t, which you multiply by the standard error to calculate the confidence interval for mu.(a) 90% confidence interval for a mean with 7 observations.t =(b) 95%...
- Q On a planet far far away from Earth, IQ of the ruling species is normally distributed with a mean of 106 and a standard deviation of 15. Suppose one individual...
- Q The lengths of pregnancies in a small rural village are normally distributed with a mean of 270 days and a standard deviation of 16 days.In what range would you expect...
- Q Surgical complications: A medical researcher wants to construct a 99.5% confidence interval for the proportion of knee replacement surgeries that result incomplications.Part 1 of 2(a) An article in a medical...
- Q Suppose that the speed at which cars go on the freeway is normally distributed with mean 72 mph andstandard deviation 6 miles per hour. Let X be the speed for...
- Q Twenty nine concrete blocks were sampled and tested for crushing strength in order to estimate the proportion that were sufficiently strong for a certain application. Twenty seven of the 29...
- Q Stacy invested $13,200 at 6 % to be compounded monthly. What will be the value of Stacy's investment in 3 years? Round your answer to the nearest cent, if necessary....
- Q A random sample of 25 Real Estate listings for houses in the Northeast section of a large city was selected from the city newspaper. A correlation coefficient of -80 was...
- Q For each research objective presented, identify the population and sample in the study: ) The Gallup organization contracts 1028 teenagers who are 13 to 17 years of age and asks...
- Q The average number of years a person takes to complete a graduate degree is 3. The standard deviation is 4. Assume the variable is normally distributed. If an individual enrolls...
- Q A college statistics class conducted a survey of how students spend their money. They gathered data from a large random sample of college students who estimated how much money they...
- Q The five number summary of a dataset was found to be:0, 1, 15, 17, 20An observation is considered an outlier if it is below:Enter an integer or decimal number [more..]An...
- Q A small regional carrier accepted 17 reservations for a particular flight with 13 seats. 7 reservationswent to regular customers who will arrive for the flight. Each of the remaining passengers...
- Q A pollster is going to sample a number of voters in a large city and construct a 90% confidence interval for the proportion who support the incumbent candidate for mayor....
- Q One way of checking the effect of undercoverage, nonresponse, and other sources of error in a sample survey is to compare thesample with known demographic facts about the population. The...
- Q Consider a value to be significantly low if its z score less than or equal to -2 or consider a value to be significantly high if its z score is...
- Q In a study, 41% of adults questioned reported that their health was excellent. A researcher wishes to study the health of people living close to a nuclear power plant. Among...
- Q Use the standard normal table to find the z-score that corresponds to the given percentile. If the area is not in the table, use the entry closest to the area....
- Q A hospital is trying to cut down on emergency room wait times. It is interested in the amount of time patients must wait before being called back to be examined....
- Q Teachers' Salaries The average annual salary for all U.S. teachers is $47,750. Assume that the distribution is normal and the standard deviation is $5680.Find these probabilities of the earnings of...
- Q A population has parameters ? = 200.1 and ?= 9.2. You intend to draw a random sample of sizen = 206.What is the mean of the distribution of sample means?What...
- Q A global research study found that the majority of today's working women would prefer a better work-life balance to an increased salary. One of the most important contributorsto work-life balance...
- Q The brain volumes (cm) of 20 brains have a mean of 1094.5 cm and a standard deviationof 126.4 cm. Use the given standard deviation and the range rule of thumb...
- Q At the Fisher farm, the weights of zucchini squash are Normally distributed, with a mean of 5 ounces and a standard deviation of 0.7 ounces. Which weight represents the top...
- Q Find the (a) mean, (b) median, (c) mode, and (d) midrange for the data and then (e) answerthe given questions.Listed below are selling prices (dollars) of TVs that are 60...
- Q Contaminated water: Polychlorinated biphenyls (PCBS) are a group of synthetic oil-like chemicals that were at one time widely used as insulation in electrical equipment and were discharged into rivers. They...
- Q Baby weight: Following are weights, in pounds, of 11 two-month-old baby girls. It is reasonable to assume that the population is approximately normal.12.34 12.2312.32 11.8710.30 12.958.51Part: 0/2Part 1 of 28.5114.138.639.34Send...
- Q Drill lifetime: A sample of 50 drills had a mean lifetime of 12.20 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is 7.02.Part 1 of 3(a)...
- Q A survey found that the American family generates an average of 17.2 pounds of glass garbage each year. Assume the standard deviation of the distribution is 2.5 pounds. Find the...
- Q A scientist wants to find the average weight of fish living in a large pond. So she will use the weights of 30 fish from the pond to find the...
- Q Life of Smoke Detectors The average lifetime of smoke detectors that a company manufactures is 5 years, or 60 months, and the standard deviation is 8 months. Find the probability...
- Q A sample of 20 computer chips were tested for speed in a certain application. The mean speed was x=495 megahertz, with a standard deviation of 10 megahertz. There was one...
- Q Answer the questions below.(a) The following number of people attended the last 9 screenings of a movie:195, 196, 197, 198, 205, 208, 209, 210, 294.Which measure should be used to...
- Q Find the critical value 2 needed to construct a confidence interval of the given level with the given sample size. Round the answer to at least three decimal places.Level 99%,...
- Q A sample of 18 participants took part in a hearing experiment. Among other things, the absolute hearing threshold (in decibels) was measured for each participant. The 18 measurements were as...
- Q Following a heat stroke, a patient's temperature averaged100.4F over a 4-day period. On the fifth and sixth days, thepatient's temperature averaged 99.1F. What was the patientsaverage temperature over the six...
- Q Salary of Full Professors The average salary of a male full professor at a public four-year institution offering classes at the doctoral level is $99,685. For afemale full professor at...
- Q In the 1992 presidential election, Alaska's election districts averaged 1,957 votes perdistrict for President Clinton. The standard deviation was 572.3. The distribution of thevotes per district for President Clinton was...
- Q Math workshops and final exams: The college tutoring center staff are considering whether the center should increase the number of math workshops they offer to help students improve their performance...
- Q You do a study of hypnotherapy to determine how effective it is in increasing the number of hours of sleep subjects get each night. You measure hours of sleep for...
- Q Suppose that 22% of all steel shafts produced by a certain process are nonconforming but can be reworked (rather than having to be scrapped). (a) In a random sample of...
- Q Suppose Exam 1 has a normal distribution with mean = 82 and standard deviation = 14.9. Select one student at random,a. find the probability that the student got at least...
- Q The weights of newborn for hippopotami is approximately Normal, with a mean of 85 pounds and a standard deviation of 10 pounds.a. What is the probability that a newborn hippo...
- Q I recommend using a graphing calculator when solving this problem.Listed below are head injury measurements from small cars that were tested in crashes. The measurements are in "hic," which is...
- Q Which of the following variables regarding football players is quantitative?1.aPosition2.bWeight3. CTeam4.dRace
- Q (a) The 9 members of the swim team completed the following numbers of laps at today's practice:76, 77, 78, 79, 80, 81, 82, 90, 91.Which measure should be used to...
- Q Clayton is standing on the top floor of Titus Tower, 354 meters above the ground. Looking down from the window, he can see City Center Park just over the top...
- Q A grocery store counts the number of customers who arrive during an hour. The average over a year is 28 customers per hour. Assume the arrival of customers follows a...
- Q Listed below are amounts of strontium-90 (in millibecquerels, or mBq) in a simple random sample of baby teeth obtained from residents in a region born after 1979. Use the given...
- Q Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of 28 pizza delivery restaurants is...
- Q Enter a number rounded to one decimal if necessary.You roll a fair die with the numbers 5-10 on its faces.You record the number on the upper face after it becomes...
- Q The following are the ratings of males by females in an experiment involving speed dating. Use the given data to construct a boxplot and identify the 5-number summary.3.0 4.0 5.0...
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