Researchers were interested in determining if grumpy old men were more likely to suffer heart disease than contented old men. A random sample of 300 men, aged between 55 and 65 years of age, was surveyed and their responses were recorded. Of the 100 grumpy old men surveyed 5 suffered from heart disease; of the 200 contented old men surveyed, 20 suffered from heart disease. Based on this information, which one of the following statements is FALSE?Group of answer choicesThe estimated difference in the incidence of heart disease for the two groups is -0.05.For constructing an approximate 95% confidence interval for (pgrumpy - pcontent ),the standard error is 0.0304.To test the hypothesis:   Ho : pgrumpy - pcontent = 0    against a two-sided alternative, the standard error will necessarily be greater than the standard error used for constructing the corresponding confidence interval.If we doubled the sample size, but still observed that 5% of the old grumpy men suffered from heart disease and 10% of the contented old men suffered from heart disease, then we would conclude that, for this age group, grumpy old men are (significantly) less likely to suffer from heat disease than contented men of a similar age.From this sample we can conclude that grumpy men, aged 55 to 65 years old, are (significantly) less likely to suffer from heart disease than contented men of a similar age.

In a recent study, 1,115 males 25 to 35 years of age were randomly chosen and asked about their exercise habits. Based on the study results, the researchers estimated the mean time that a male 25 to 35 years of age spends exercising with 90%, 95%, and 99% confidence intervals. These were (not necessarily in the same order):For which of the three intervals do you have the most confidence that it captures the population mean (μ)?(3, 4)(2.5, 4.5)(2, 5)The confidence interval in which you have the most confidence that it captures the population mean μ must be:the 90% confidence intervalthe 95% confidence intervalthe 99% confidence intervalWhich of the three confidence intervals provides the most precise estimation?(3, 4)(2, 5)(2.5, 4.5)The confidence interval that provides the most precise estimation, must be:the 99% confidence intervalthe 95% confidence intervalthe 90% confidence interval

In June 2015, Gallup conducted a poll of a random sample of 14,683 adults to determine the well-being of people living in the United States. One question asked, “Did you exercise at least 30 minutes for 3 or more days in the past week?” In the survey, 58.9% of males and 52.7% of females responded yes to this question. Which of the following is true about this scenario? 58.9% and 52.7% are both parameters. 58.9% and 52.7% are both statistics. If we took another random sample of 14,683 adults, we would expect to get the exact same results.

Height and age: Are older men shorter than younger men? According to a national report, the mean height for U.S. men is 69.4 inches. In a sample of 304 men between the ages of 60 and 69, the mean height was =x68.8 inches. Public health officials want to determine whether the mean height μ for older men is less than the mean height of all adult men. Assume the population standard deviation to be =σ3.13. Use the =α0.05 level of significance and the P-value method with the TI-84 Plus calculator.Part 1 of 5(a) State the appropriate null and alternate hypotheses.:H0  =μ69.4:H1  <μ69.4This hypothesis test is a ▼left-tailed test.Part: 1 / 51 of 5 Parts CompletePart 2 of 5(b) Compute the value of the test statistic. Round the answer to two decimal places.z=

In a random sample of 373 people that were tested for the Norcovirus, it was found that 321 did not have the virus. A 94% confidence interval was constructed to estimate the proportion of the population that does not have the Norcovirus. This confidence interval came out to be (0.83,0.89).Select the correct intrepretation of this interval.We are 94% confident that the proportion of people in the sample that tested postitive for the Norcovirus is between 83% and 89%.We are 94% confident that the proportion of people in the sample that tested negative for the Norcovirus is between 83% and 89%.We are 94% confident that the proportion of the population that have the Norcovirus is between 83% and 89%.We are 94% confident that the proportion of the population that does not have the Norcovirus is between 83% and 89%.

Watch your cholesterol: A sample of 316 patients between the ages of 38 and 82 were given a combination of drugs ezetimibe and simvastatin. They achieved a mean reduction in total cholesterol of 0.95 millimole per liter. Assume the population standard deviation is =σ0.19.Part: 0 / 30 of 3 Parts CompletePart 1 of 3(a) Construct a 99% confidence interval for the mean reduction in total cholesterol in patients who take this combination of drugs. Round the answer to at least two decimal places.A 99% confidence interval for the mean reduction in cholesterol is <<μ.