Calculate the left and right chi square values, then give the confidence interval. Sample Standard Deviation s = 31 Confidence Level c = 0.90 and Sample Size n = 21 %3D and x %3D %3D At the 90 % level of confidence the population standard deviation is between and (Round all answers to 3 decimal places)

You measure 30 watermelons' weights, and find they have a mean weight of 36 ounces. Assume the population standard deviation is 8.7 ounces. Based on this, construct a 99% confidence interval for the true population mean watermelon weight.Round your answers to two decimal places. __________< μ < __________

nework: Chap A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is x = 850 and the sample standard deviation is s= 15. 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 30. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (c) Construct an interval estimate of u with 95% confidence, assuming that s = 60. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (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. O The interval gets narrower as s increases.

Age of College Students Find the 90% confidence intervals for the variance and standard deviation of the ages of seniors at Oak Park College if a random sample of 20 students has a standard deviation of 2.2 years. Assume the variable is normally distributed. Use the chi-square distribution table to find any chi- square values to three decimal places. Round the final answers to one decimal place.

High School Competency Test A mandatory competency test for high school sophomores has a normal distribution with a mean of 380 and a standard deviation of 81. Round the final answers to the nearest whole number and intermediate z-value calculations to 2 decimal places. The top 4% of students receive $500, what is the minimum.co (b) The bottom 2% of students must go to summer school. What is the minimum score you would need to stay out of this group? The minimum score needed to stay out of this group is 0 X $

Qualifying Test Scores To qualify for a medical study, an applicant must have a systolic blood pressure in the 60% of the middle range. If the systolic blood pressure is normally distributed with a mean of 120 and a standard deviation of 5, find the upper and lower limits of blood pressure a person must have to qualify for the study. Round final answers to 1 decimal place and intermediate :-value calculations to 2 decimal places. Applicants must have a lower blood pressure limit of and an upper blood pressure limit of to qualify for the study. Ol

Soft Drink Consumption A researcher claims that the yearly consumption of soft drinks per person is 52 gallons. In a sample of 58 randomly selected people, the mean of the yearly consumption was 53.1 gallons. The standard deviation of the population is 3.5   gallons. On the basis of the P-value, is the researcher's claim valid at   α=0.02? Use a graphing calculator.  Find the P-value. Round the answer to at least four decimal places.  P-value=

Prison Sentences The average length of prison term in the United States for white collar crime is 34.9 months. A random sample of 40 prison terms indicated a mean stay of 28.8 months with a standard deviation of 8.9 months. At α=0.01, is there sufficient evidence to conclude that the average stay differs from 34.9 months? Use the   P-value method. Use a graphing calculator.  Find the P-value. Round the answer to at least four decimal places.  P-value=

Qualifying Test Scores To qualify for a medical study, an applicant must have a systolic blood pressure in the 70% of the mlddle range. If the systollc blood pressure Is normally distributed with a mean of 120 and a standard deviation of 3, find the upper and lower limits of blood pressure a person must have to qualify for the study. Round final answers to 1 decimal place and Intermediate z-value calculations to 2 decimal places. Applicants must have a lower blood pressure limit of and an upper blood pressure limit of to qualify for the study. Save For Later Submit Assi Check 2021 McGraw-Hill Education. All Rights Reserved. Terms of Use Privacy A

Breaking Strength of Cable A special cable has a breaking strength of   800 pounds. The standard deviation of the population is 12 pounds. A researcher selects a sample of 19 cables and finds that the average breaking strength is 795 pounds. Can he reject the claim that the breaking strength is 800 pounds? Use the P-value method with alpha= 0.05 level of significance. Assume that the variable is normally distributed. Use a graphing calculator.  Find the P-value. Round the answer to at least four decimal places.