# Question

a. A random sample of 100 observations was drawn from a normal population. The sample variance was calculated to be s2 = 220. Test with α = .05 to determine whether we can infer that the population variance differs from 300.

b. Repeat Part a changing the sample size to 50.

c. What is the effect of decreasing the sample size?

b. Repeat Part a changing the sample size to 50.

c. What is the effect of decreasing the sample size?

## Answer to relevant Questions

a. The sample variance of a random sample of 50 observations from a normal population was found to be s2 = 80. Can we infer at the 1% significance level that σ2 is less than 100?b. Repeat part (a) increasing the sample size ...During annual checkups physicians routinely send their patients to medical laboratories to have various tests performed. One such test determines the cholesterol level in patients’ blood. However, not all tests are ...a. The proportion of successes in a random sample of 400 was calculated as 50%. Estimate the population proportion with 95% confidence.b. Repeat part (a) with p̂ = 33%.c. Repeat part (a) with p̂ = 10%.d. Discuss the effect ...In Chapter 6, we discussed how an understanding of probability allows one to properly interpret the results of medical screening tests. The use of Bayes’s Law requires a set of prior probabilities, which are based on ...Refer to the chapter-opening example. Estimate with 95% confidence the number of Americans 18 to 49 years old who were tuned to the American Idol.12.115 Xr12-115 12.116 Xr12-116Post your question

0