A simple random sample of 50 adults is obtained.
2. A simple random sample of 50 adults is obtained, and each person’s red blood cell count (in cells per microliter) is measured. The sample mean is 5.23 and the sample standard deviation is 0.54. Use a 0.01 significance level to test the claim that the sample is from a population with a mean less than 5.4. Based on the above situation, compute the value of the test statistic .
3. How do you conduct a study properly? Formulate the indicated conclusion in nontechnical terms. Be sure to address the original claim: A researcher claims that 62% of voters favor gun control. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms.
4. A buyer wants to compare the cost (in dollars) of airline tickets purchased one day in advance to purchased 30 days in advance for flights from New York (JFK) to San Francisco for various airlines. Use a 0.01 significance level to test the claim that flights scheduled one day in advance cost more than flights scheduled 30 days in advance. A computer is used and it is found that the P-value = 0.0016. What can you state about the sample (independent or dependent) and what can you conclude about the evidence?