K: Chapter 8 (Sections 8.4 through... i Saved Help Save & Exit Subt Check my work A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is = 830 and the sample standard deviation is s = 5. Use Appendix D to find the values of Student's t. (a) Construct an interval estimate of u with 95% confidence. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (b) Construct an interval estimate of u with 95% confidence, assuming that s = 10. (Round your answers to 3 decimal places.) to The 95% confidence interval is from (c) Construct an interval estimate of u with 95% confidence, assuming that s= 20. (Round your answers to 3 decimal places.) to The 95% confidence interval is from (d) Describe how the confidence interval changes as s increases. The interval stays the same as s increases. The interval gets wider as s increases. 6 of 10 Next > < Prev ........ .... ....... 76% е н L ப search

Need help on a and finding the t and p value

Answer part C

You review your data from a population A and population B. The mean and standard deviation are noted as N(mean, standard deviation). NA(400,10) and NB(300,25). 95 percent of the observations for population A exceed a value of___________?95 percent of the observations for population B are less than a value of _____________?

Overweight Men For a random sample of  55  overweight men, the mean of the number of pounds that they were overweight was  28 . The standard deviation of the population is  4.6  pounds. Use a graphing calculator and round the final answers to one decimal place.   Part: 0 / 4 0 of 4 Parts Complete   Part 1 of 4         The best point estimate of the mean is     pounds.     ?

Please help with question #4

Water Temperature If the variance of the water temperature in a lake is 28°, how many days should the researcher select to measure the temperature to estimate the true mean within 3° with 90% confidence? Round the intermediate calculations to two decimal places and round up your final answer to the next whole number. The researcher needs a sample of at least days.

Plz help asap 28