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: Spinning a coin, unlike tossing it, may not give heads and tails equal probabilities. I spun a penny…

A: It is given that n=250 and x=109.

Q: The standard deviation of the weights of elephants is known to be approximately 15 pounds.  We wish…

A: Sample mean = x̅ = 244 Sample size = n = 50 Population S.D = σ = 15 Standard Error = σ/√n  =…

Q: A professor is trying to find the average exam grade in his class. The sample mean should be within…

A: It is given that confidence level is 0.90, standard deviation is 12 and margin of error E is 5.

Q: You want to estimate the mean time college students spend watching online videos each day.  The…

A:

Q: In a random sample of eight ​people, the mean driving distance to work was 19.3 miles and the…

A: The question is about confidence interval Given : Randomly selected no. of people ( n ) = 8 Sample…

Q: 4. A recent study of 19 students of San Rafael College showed that the mean of the distance they…

A:

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: You want to purchase a used car. The mean monthly payment for a random sample of 12 cars advertised…

A: Given: n=12x¯=275σ=35 Confidence level = 95%

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

A: Solution

Q: 88, 89,-58,-52, 64, -100, 39, -98, -52, -34, 46, 47, 29, -8, 94 Send data to calculator se that…

A: We have given that,  X :- -88, 89, -58, -52, 64, -100, 39, -98, -52, -34, 46, 47, 29, -8, 94 Then,…

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: How much do wild mountain lions weigh? Six adult wild mountain lions are captured and released.…

A: Given data , 68, 104, 128, 122, 60, and 64.

Q: A study was commissioned to find the mean weight of the residents in certain town. The study…

A: Given: n=58, x=174 and s=38. Now,Degrees of freedom=n-1=58-1=57 Then, at 95% confidence level, the…

Q: 2. In a recent study of 35 college students, the mean number of hours per week that they played…

A: According to the given information in this question  We need to find the 95% confidence interval

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: If the mean and standard deviation of a sample of size 45 is 1050 and 52 respectively, construct a…

A: It is given that Sample mean = 1050Sample standard deviation = 52Sample size = 45Confidence level =…

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

A:

Q: The lead levels in a random sample of 35 crows in the region were measured and recorded. The mean…

A: It is given that  Sample size n = 35 Sample mean M = 4.50 Sample SD s = 1.12 Confidence level = 99%…

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: There are four questions about this problem in the test shown in random order. Out of 1000 customers…

A: It is given that the There are a total of 1000 customers in the test data and it is known that there…

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

A:

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: 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: Sales personnel for City Distributors Inc. submit weekly reports listing the customer complaints…

A: Given Information: Sample size (n) = 8 Sample mean (x¯) = 8 Sample standard deviation (s) = 3.464 To…

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: You measure 27dogs' weights, and find they have a mean weight of 63 ounces. Assume the population…

A:

Q: If the sample mean is 37.7 and population standard deviation is = 9.2 and the sample size is 100…

A: Provided that the sample mean x¯=37.7 and the population standard deviation σ=9.2. The sample size…

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…