Assuming that the population standard deviation is given as 48.9. The sample statistics are n=19 and mean = 58.2. Then, the resulting 95% confidence interval for population mean is: O a. 43.84 < μ< 72.56 O b. 39.75 < p < 76.65 O c. 36.21 < p < 80.19 O d. 29.26 < μ< 87.14

The mean difference in the sample (n=100) is -12.7 with a standard deviation of 8.9. A. construct a 95% confidence interval for the mean differences in depressive symptoms between drug and placebo. B. From a statistical standpoint, does this represent a significant change in depressive symptoms between the new drug and the placebo?

Salaries of 34 college graduates who took a statistics course in college have a mean, x, of $67,400. Assuming a standard deviation, o, of $15,845, construct a 90% confidence interval for estimating the population mean u.

A product is designed to have length of 14cm+/0.12cm. the output of the manufacturing process is identified to be centered at 14.0.042cm and the standard deviation is estimated at 0.014cm. determine the capability of the system Cp

Construct a  90%  confidence interval for the population mean,  μ . Assume the population has a normal distribution. A sample of  15  randomly selected students has a grade point average of  2.81  with a standard deviation of  0.63 .

In a random sample of twelve people, the mean driving distance to work was 21.3 miles and the standard deviation was 7.3 miles. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 99% confidence interval for the population mean μ. Interpret the results. Identify the margin of error. (Rol square miles miles per hour miles s needed.)

ACT scores are normally distributed with mean 22 and standard deviation 4.7. A random sample of 32 MiSU students has a mean ACT of 23.6.  A. Estimate the mean ACT score for all MiSU students at the 95% confidence level. B. If we want to estimate the mean ACT score for all MiSU students at the 99% confidence level with a margin of error of 10, then what sample size will we need?

Salaries of 46 college graduates who took a statistics course in college have a​ mean, x​, of $65,100. Assuming a standard​ deviation, σ​, of ​$13,840​, construct a 90​% confidence interval for estimating the population mean μ.