A tire manufacturer would like to estimate the average tire life of its new all-season light truck tire in terms of how many milles it lasts. Determine the sample size needed to construct a 96% confidence interval with a margin of error equal to 2,800 miles. Assume the standard deviation for the tire life of this particular brand is 7,500 miles. The sample size needed is (Round up to the nearest integer.)

Q: A random group of 36 people in Toms River were asked “how much money did you spend at the grocery…

A: Given: Sample mean x¯=149.50 Sample size (n) = 36 Sample standard deviation (s) = 22.50 Confidence…

Q: For 30 randomly selected Rolling Stones concerts the mean gross earnings is 2.59 million dollars.…

A:

Q: The ages of registered voters in Smith County are normally distributed with a population standard…

A: Given:

Q: A sample of 22 households uses an average of 346.2 gallons of water per day, with a sample standard…

A: The sample size is 22, sample mean is 346.2 and sample standard deviation is 50.5.

Q: the standard deviation of the 16 observations was 0.95 inches (again, the sample mean was 17.2).…

A: Given :  Standard deviation of the 16 observations was 0.95 inches & the sample mean was 17.2.…

Q: In a sample of 100 individuals, the average height is 170 cm with a standard deviation of 10 cm.…

A: The 95% confidence interval for the population mean height is calculated as:  (170 cm - 1.96 * (10…

Q: In a random sample of ten ​people, the mean driving distance to work was 19.2 miles and the…

A:

Q: A local police department made an effort to determine the average speed of automobiles travelling…

A:

Q: In a random sample of twelve ​people, the mean driving distance to work was 21.5 miles and the…

A: Solution

Q: In a random sample of 15 ​people, the mean driving distance to work was 18.5 miles and the standard…

A:

Q: A random sample of 35 high-school students averaged 7.3 hours of sleep per night. Assume a…

A: Obtain the 95% confidence interval for the population mean. The 95% confidence interval for the…

Q: In a random sample of five ​people, the mean driving distance to work was 19.9 miles and the…

A: Given Sample size, n = 5 Degree of freedom, n-1 = 4 Sample mean, x = 19.9 miles Sample standard…

Q: he average weight of 20 randomly selected cars was 3500 pounds. The sample standard deviation was…

A: given data, n=20df=n-1=20-1=19x¯=3500 pounds s=315 pounds CI=0.90α=1-0.90=0.10

Q: A random sample of 11 fields of spring wheat has a mean yield of 20.2 bushels per acre and standard…

A: Sample size, n=11 Sample mean, x¯=20.2 Sample sd, s=5.19 CL=0.99

Q: A large urgent care center with 4 doctors found that they can see an average of 28 patients per…

A: We have given that Sample size (n) = 41Sample mean (x̅) = 28Standard deviations (s) =…

Q: Construct a 90% Confidence Interval for the mean.

A: Let  be the population mean of water per day.Given that,Sample size Sample mean Sample standard…

Q: survey asked 8 adults how many years of education they had. The sample mean was 12.90 with a sample…

A:

Q: In a random sample of ten people, the mean driving distance to work was 21.8 miles and the standard…

A: Given,sample size(n)=10mean(x)=21.8standard deviation(σ)=6.4α=1-0.99=0.01α2=0.005degrees of…

Q: A runner wants to know her average mile running time. She records a sample of 25 running times. The…

A: Solution: Let X be the mile running time. From the given information, x-bar=6.5 minutes, s=0.7…

Q: 1. The Sports Associates Vending Company supplies refreshments at a baseball stadium and must plan…

A: X Frequency 4 13 5 22 6 20 7 34

Q: A survey of first time homeowners found that the sample mean annual income was $53,000. Assume that…

A:

Q: A sample of 22 public high school students spent an average of 6.5 hours studying per week. Assuming…

A:

Q: Calculate the lower endpoint of a two-sided 95% confidence interval for the population mean using…

A: given data sample size (n) = 41sample mean ( x¯ ) = 11.92population standard deviation (σ) = 1.8195%…

Q: for a sample of 150 that has a mean of 6540 and a standard deviation of .89, calculate the 95%…

A: It is given that mean and standard deviation are 6,540 and 0.89, respectively.

Q: A food snack manufacturer samples 11 bags of pretzels off the assembly line and weighs their…

A:

Q: A popular weight loss program claims users will lose weight each month. Linda samples 25 dieters and…

A: We have given that,  Sample mean (x̄) = 10 pounds, standard deviation (s) = 2 pounds and sample size…

Q: Find a 99% confidence interval for μ.

A: The sample size is n = 7 Sample mean = 46.14 Sample SD s = 1.19 At 99% confidence level and df = (n…

Q: A study of 81 bolts of carpet showed that their average length was 77.5 yards. The standard…

A:

Q: In a random sample of six ​people, the mean driving distance to work was 24.3 miles and the…

A:

Q: Find the 90% confidence interval for the standard deviation of the lengths of pipes if a sample of…

A: given data s = 10.2 n = 22 90% CI for σ = ? α = 1 - 0.90 = 0.10df = n - 1 = 21χ2L = χ21-α2,n-1…

Q: A NAPA Auto Parts supplier wants information about how long car owners plan to keep their cars. A…

A: From the provided information, Sample size (n) = 41 Sample mean (x̅) = 7 Sample standard deviation…

Q: company manufactures a certain over-the-counter drug. The company samples 80 pills and finds that…

A: We have given that  Sample size n = 80 Sample mean = 325.5 Standard deviation s=10.3 90%confidence…

Q: for a sample of 57 that has a mean of 6200 and a standard deviation of 254, calculate the 95%…

A:

Q: or a sample of 121 that has a mean of 6540 and a standard deviation of 780, calculate the 90%…

A:

Q: A small business wanted to estimate the mean income from their customers. They took a sample of 256…

A: We have to find  the 90% confidence interval estimate for the population mean income of their…

Q: In a random sample of twelve ​people, the mean driving distance to work was 18.8 miles and the…

A: From the given information we want to construct 90% confidence interval.

Q: D. How many are enlisted or have a civilian marriage? E. How many are neither enlisted nor have a…

A: AS per our guidelines we are suppose to answer three sub parts.

Q: In a randoms sample of six people, the mean driving distance to work was 19.7 miles and the standard…

A: Given, sample mean (x̄) = 19.7 sample standard deviation (s) = 6.1 sample size (n) = 6 significance…

Q: A study of 96 bolts of carpet showed that their average length was 77.5 yards. The standard…

A:

Q: A college admissions director wishes to estimate the mean age of all students currently enrolled. In…

A: Given, Sample size n = 30 Sample mean x¯ = 21.5 Standard deviation σ = 1.2 at 95% confidence…