Suppose a random sample of 32 canned products are inspected and an average of 7 of them are reported to have been expired with a standard deviation of 2.  a) Find the sample standard deviation s for this t-distribution. b) Find the t-statistic needed for a 95% confidence interval c) Construct a 95% confidence interval for the population mean and interpret your interval.

Q: A researcher collected sample data for 11 women ages 18 to 24. The sample had a mean serum…

A:

Q: Suppose that the population standard deviation of students score is 20. what is the sample size so…

A:

Q: The Fox TV network is considering replacing one of its prime-time crime investigation shows with a…

A: a.The value of the population proportion is estimated below:From the given information, in a random…

Q: Suppose that the number of students passed a Statistics class are normally distributed. A simple…

A: We have given that  The number of students passed a Statistics class are normally distributed. A…

Q: fitness of 514 adults (aged 25 to 35) were sampled and their heart rates measured immediately after…

A: Given that  Sample size n =514 Sample mean=1427 Population standard deviation =325

Q: A quality control manager wants to be sure that the standard deviation of oil containers is below a…

A: Let Xi be the amount of oil in the ith container,i=1,2,...,n.

Q: From the normally distributed systolic blood pressures of a given patient population with a standard…

A: Sample mean = x̅ = 120 Sample size = n = 9 Population S.D = σ = 24 Standard Error = σ/√n  =…

Q: We take a sample of 50 people and obtain a sample mean of 147 pounds with a standard deviation of 15…

A: We have given that  Sample size n = 50 Sample mean = 147 Standard deviation = 15 90%confidence…

Q: Suppose that the number of students passed a Statistics class are normally distributed. A simple…

A:

Q: A researcher collected sample data for 17 women ages 18 standard deviation of 9.3. Assuming that…

A:

Q: A random sample of 12 chemists from Washington stats shows an average salary of $39,420 with a…

A: The sample mean one (Washington): x¯1=$39,420, sample mean two (New Mexico): x¯2=$30,215, population…

Q: A sample of 20 items provides a sample standard deviation of 14. a. Compute the 90% confidence…

A: Given n=20 s=14 The (1-α)*100% confidence interval for σ2 is:(n-1)*s2X2α/2< σ2…

Q: Suppose scores on exams in statistics are normally distributed with an unknown population mean and…

A:

Q: Suppose that the population standard deviation of student scores is 20. What will be the sample size…

A:

Q: Construct a 90% Confidence Interval for the population mean u

A: Given that the sample size is n = 36 Sample mean = 106 Population SD = 12 At 90% confidence level,…

Q: Suppose a sample of 30 LCC students are given an IQ test. The sample has a standard deviation of…

A: Given the following information- n=30s=12.24s2=149.82

Q: Suppose we are interested in a confidence interval for the population mean scores on an exam. A…

A: We have given that.Sample size (n) = 99Sample mean (x̅) = 95.71Population Standard deviations (σ) =…

Q: In a study, Group 1 was found to have an average of 53 and a population standard deviation of 13 out…

A:

Q: Find an 80% confidence interval for the heart rates of US adults over 25 if a sample of size 15 is…

A: Find the distribution that has to be used to construct the confidence interval in the given…

Q: Construct the indicated confidence interval for the difference between the two population means.…

A: Given:- The data describes the hours men and women had watched television during the previous week.…

Q: Suppose that the number of students passed a Statistics class are normally distributed. A simple…

A:

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: Suppose you observe 62 data points from a distribution with standard deviation 2.1, and you…

A: Given, n=62 data points standard deviation SD= 2.1, calculated a 92% two-sided confidence interval…

Q: A simple random sample with n=52 provided a sample mean of  21.0 and a sample standard deviation of…

A: a. The degrees of freedom is, Computation of critical value: The critical value of t-distribution…

Q: Suppose that the true population standard deviation (this assumption is made only for this question,…

A:

Q: Then find the lower limit and upper limit of the 90% confidence interval.

A:

Q: Find the value of ta/2 and n = 25 for the 90% confidence interval for the mean if the population…

A:

Q: Suppose we gather a random sample of 20 data points. Assume the population standard deviation is 11.…

A: Given,   Sample size = 20 Sample mean = 23 Population standard deviation = 11   Since the population…

Q: Suppose average pizza delivery times are normally distributed with an unknown population mean and a…

A: The provided information is:

Q: The mean IQ for the entire population in any age group is known to be 100 with a standard deviation…

A: The random variable IQ follows normal distribution. The population standard deviation is 15. The…

Q: Calculate the 95% confidence interval and the 99% confidence interval for a sample of 81 where the…

A: Given : Sample Size, n = 81 Sample Mean, x̄ = 50 sample standard…