ou intend to estimate a population mean μμ with the following sample. 0.3 14 43.2 63.8 28.5 67.1 26.8 41 23.3 HINT: Use the One Quantitative calculator to find the Mean and Standard Deviation of the sample You believe the population is normally distributed. Find the 95% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to TWO decimal places (because the sample data are reported accurate to one decimal place). 95% C.I. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. help me, please Please help me, I have a hard time with my homework. I struggle

You are given the sample mean and the population standard deviation. Use this information to construct the​ 90% and​ 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals.   From a random sample of 49   business​ days, the mean closing price of a certain stock was ​$109.89 . Assume the population standard deviation is ​$10.27 .

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.

You are given the sample mean and the population standard deviation. Use this information to construct the​ 90% and​ 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If​ convenient, use technology to construct the confidence intervals. A random sample of 45 home theater systems has a mean price of ​$114.00. Assume the population standard deviation is ​$15.30. Construct a​ 90% confidence interval for the population mean.

Suppose that textbook weights are normally distributed.  You measure 30 textbooks' weights, and find they have a mean weight of 65 ounces. Assume the population standard deviation is 11.6 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight. Round answers to 2 decimal places.?        ?         ?

You work for a soft-drink company in the quality control division.  You are interested in the standard deviation of one of your production lines as a measure of consistency. The product is intended to have a mean of 12 ounces, and your team would like the standard deviation to be as low as possible.  You gather a random sample of 15 containers.  Estimate the population standard deviation at a 80% level of confidence.   11.86 12.12 12.2 12.08 12.06 12.09 11.92 12.26 12.04 12.1 11.85 11.97 11.85 12 12.01   (Data checksum: 180.41)  Keep as many decimals as  possible while making these calculations.  a)  Find the sample standard deviation:   b)  Find the lower and upper χ2χ2  critical values at 80% confidence:Lower:     Upper:  c)  Report your confidence interval for σσ:

You need to compute the a 90% confidence interval for the population mean. How large a sample should you draw to ensure that the sample mean does not deviate from the population mean by more than 1.5? (Use 9.2 as an estimate of the population standard deviation from prior studies.) (You may find it useful to reference the z table. Round intermediate calculations to at least 4 decimal places. Round "z" value to 3 decimal places. Round up your answer to the nearest whole number.) Sample size

You are given the sample mean and the population standard deviation. Use this information to construct the​ 90% and​ 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals.From a random sample of 66 ​dates, the mean record high daily temperature in a certain city has a mean of 85.22 F. Assume the population standard deviation is 15.45 F.