(a) A sample of 12 drivers shows the time that they spent (in minutes) stopped in rush-hour traffic on a specific snowy day last winter. Find variance and standard deviation. 52, 56, 53, 61, 49, 51, 53, 58, 53, 60, 71, 58 (b) The average of the number of trials it took a sample of mice to learn to traverse a maze was 12. The standard deviation was 3. Using Chebyshev's theorem, find the minimum percentage of data values that will fall in the range of 4–20 trials.

Q: Executives of a supermarket chain are interested in the amount of time that customers spend in the…

A: 1.The given claim is to test, whether the mean μ is less than 38 minutes. So here Ho: μ = 38 VS Ha :…

Q: 2. The standard deviation as a measure of variability determines the extent to which performance in…

A: Given : There is a test conducted to check whether the standard deviation is homogeneous or…

Q: If 80% of the applicants are able to pass a driver's license proficiency road test. Find the mean,…

A:

Q: 00 freshmen at Arundel University took part in a math comprehension test. The scores were normally…

A: The middle (center) of the normal curve represents the mean of the curve. The normal curve is the…

Q: Length of Stay - Health insurers and federal government are both putting pressure on hospitals to…

A:

Q: 1- A health researcher read that a (200)pound male can burn an average of (546) calories per hour…

A: In statistical inference, there are two types of sample tests. One is a small sample test and…

Q: How do a paired-sample design and an independent-sample design differ?

A: (1) Determine the difference between the paired sample design and independent sample design.…

Q: Executives of a supermarket chain are interested in the amount of time that customers spend in the…

A: We are given that the mean shopping time spent by customers at the supermarkets is The sample mean…

Q: 7. A statistical study of elves results in finding a mean height of 38.5 inches with a standard…

A:

Q: In this problem, we consider a small set of evidence for global warming by comparing how…

A: Given: d=1.15,SDd=4.25,n=54

Q: 4. The time taken to boil a kettle is normally distributed with a mean of 94 seconds and a standard…

A: Define the Random Variable, X : The time taken to boil a kettle Given that, X ~ N(94,62) Therefore,…

Q: In preparation for the upcoming school year, a teacher looks at raw test scores on the statewide…

A: Given data,Mean μ=49sd σ=20.7z-score =2Test score X=?

Q: b)Does vigorous exercise affect concentration? In general, the time needed for people to complete a…

A:

Q: According to a Survey, households in the city X spend an average of $24 per week on their leisure…

A:

Q: Suppose that Sacramento workers have a mean commute of 17 minutes and commute times are normally…

A:

Q: 3. An extensive study of the cost of health care in the United States presented data showing t the…

A:

Q: A college professor calculates the standard deviation of all the grades from the midterm exams she…

A: Standard deviation: The standard deviation indicates by how much each observation differs from a…

Q: The record of 35 randomly selected participants of a marathon was selected. The mean time it takes…

A:

Q: 1. In a normally distributed set of data containing 24 114 scores, how many scores is expected to be…

A: As per our company guidelines we are supposed to answer only first question. Kindly repost other…

Q: A machine produces electrical components. 99.7% of the components have lengths between 1.176 cm and…

A: Given 99.7% components length lies between 1.176 and 1.224 m Using empericals rule we know that…

Q: 23. Watching Fireworks A survey found that 21% of Americans watch fireworks on television on July…

A:

Q: c) A researcher wishes to claim that the average final examination mark of Manufacturing Technology…

A:

Q: A custodian wishes to compare two competing floor waxes to decide which one is best. He believes…

A:

Q: tal of 82 Grade 11 students of ABC senior high school took the 60 item test in General mathematics.…

A: To find the normal distribution with the mean 42 and standard deviation 6

Q: Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from…

A:

Q: 4. A wildlife study is designed to find the mean weight of salmon caught by an Alaskan fishing…

A: Here sample size, n=50≥30. Thus, the central limit theorem holds true. Let x¯ and μ denote the…

Q: Suppose the time people take to find a parking spot at the annual State Fair is normally distributed…

A:

Q: 7. Most individuals are aware of the fact that the average annual repair cost for an auto- mobile…

A: Given  n1=26, s1=170, n2=25, s2=100,ɑ=0.01 We want to test the hypothesis.

Q: 5. Arbitron Media Research Inc. conducted a study to compare the variance of the iPod listening…

A: x1 = 35 s1 =10 n1 = 10 x2 =35 s2=12 n2=12

Q: Compute the value of the test statistic.

A: For class 1, sample size n1 = 15, sample mean = 81.2, sample SD = 3.4 For class 2, sample size n2 =…

Q: 3. A researcher is conducting a study to determine the mean trough dosage of medication for a…

A: The formula for the sample size is as follows: Here, zα/2 is the critical value at (1-α) %…

Q: 5. It has been reported that the average credit card debt for college seniors is $3262. The student…

A: Given,sample size(n)=50sample mean(x¯)=$2995standard deviation(σ)=$1100α=0.05a)…

Q: the same study on hours spent studying statistics, you decide to loook at the variance instead of…

A:

Q: A pharmaceutical company claims that its new medication results in side effects for 20% of those…

A: n = 100 p = 0.2

Q: Find the​ range, variance, and standard deviation for the given sample​ data, if possible. If the…

A: x x2 1 1 2 4 2 4 2 4 3 9 2 4 4 16 2 4 2 4 2 4 2 4 3 9 1 1 2 4 2 4 2…

Q: 17. In a study in New York, single college men were studied to see if hair color made a difference…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Consider a small scale example, comparing how temperatures have changed in the US from 1968 to 2008.…

A:

Q: 1. A rental car company claims the mean time to rent a car on their website is 60 seconds with a…

A: Given: Population mean μ = 60 seconds Standard deviation σ = 22 seconds sample mean x = 55 seconds…

Q: 2. In a study of inter spousal aggression and its possible effect on child behavior, the Behavior…

A:

Q: Credit Card Debt It has been reported that the average credit card debt for college seniors at the…

A: Given problem Given that   Credit Card Debt  It has been reported that the average credit card…

Q: Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from…

A: In question, Given that Pilots who cannot maintain regular sleep hours due to their work schedule…

Q: According to Consumer Expenditures, the average consumer spent $1729 on apparel and services in…

A: Given information- Population mean, μ = $1729 Sample size, n = 36 Sample mean, x-bar = $1667.11…

Q: The noon winter temperature in Chicago is normally distributed with a mean of 36 degrees Fahrenheit…

A:

Q: 9. You are an agricultural consultant researching the effect of different ground surfaces for dairy…

A: Solution: 9. a. State the hypotheses. Null hypothesis: That is, the mean yield from cows on…

Q: A local hospital doctor's team reports that the average cost of treatment of heart disease is 800…

A:

Q: The daily number of bad checks received by a large department store in a random sample of 5 days out…

A: Given sample data,   Standard deviation =?

Q: 3. An extensive study of the cost of health care in the United States presented data showing that…

A: