The standard deviation for a population is o = 14.2. A sample of 25 observations selected from this population gave a mean 142.80. The population is known to have a normal distribution. Round your answers to two decimal places. a. Make a 99% confidence interval for μ. b. Construct a 97% confidence interval for μ. i c. Determine a 95% confidence interval for u. i i d. Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases?

Shown below is the confidence interval (CI) for the difference, µ, - H2, between two population means. Interpret the confidence interval. 90% Cl is from 20 to 30 Choose the correct answer below. O A. It can be said, with 90% confidence, that there is no significant difference between the value of Hj and the value of lz. Note that this means the difference between the two means may be zero O B. It can be said, with 90% confidence, that the value of u, is somewhere between 20 and 30 less than the value of h. Note that this means the difference between the two means is less than zero. O c. It can be said, with 90% confidence, that the value of u, is somewhere between 20 and 30 greater than the value of µ. Note that this means the difference between the two means is greater than zero O D. The true value of l, - H, lies somewhere between 20 and 30. Note that this means the difference between the two means is greater than zero.

Exb 9 and 10

The weights of running shoes are normally distributed with an unknown population mean and standard deviation. If a random sample of 23 running shoes is taken and results in a sample mean of 12 ounces and sample standard deviation of 3 ounces, find the margin of error for a 95% confidence interval estimate for the population mean and construct the interval. Round the final answers to two decimal places. ME =                     C.I.   = (     ,     )

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A random sample of 88 observations produced a mean x=25.8 and a standard deviation s=2.5. a. Find a​ 95% confidence interval for μ. b. Find a​ 90% confidence interval for μ. c. Find a​ 99% confidence interval for μ.           a. The​ 95% confidence interval is (enter your response here,enter your response here).

The following information is obtained for a sample of 80 observations taken from a population. SS xx 370.842, se = 0.922, and y = 164.43 - 2.83x Make a 97 % confidence interval for B. = Round your answers to two decimal places. The 97 % confidence interval for Bis ( i ).

Tina catches a 14-pound bass.  She does not know the population mean or standard deviation.  So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds.  Find the t and calculate a 95% (α = .05) confidence interval.

A laboratory tested 85 chicken eggs and found that the mean amount of cholesterol was 191 milligrams. Assume that o = 16.2 milligrams. Construct a 95% confidence interval for the true mean cholesterol content, µ, of all such eggs. Round to one decimal place. O A. 186.9 to 195.1 milligrams B. 186.5 to 195.5 milligrams C. 188.1 to 193.9 milligrams D. 187.6 to 194.4 milligrams

If X=115​, σ=22​, and n=36​, construct a 95​% confidence interval estimate of the population​ mean, μ.   Click here to view page 1 of the cumulative standardised normal distribution table. LOADING... Click here to view page 2 of the cumulative standardised normal distribution table. LOADING...       The 95​% confidence interval is enter your response here≤μ≤enter your response here. ​(Round to two decimal places as​ needed.)