Researchers constructed a confidence interval for the mean body temperature of healthy US adults, using a random sample of 1000 healthy adults in the US. They found their 99% confidence interval to be (97, 99) degrees Fahrenheit. Which of the following statements are correct? Select one or more: a. The sample mean body temperature of the 1000 adults in our specific sample is between 97 and 99. O b. A 90% confidence interval calculated using the same sample data would be narrower than the given confidence interval. Oc. We are 99% confident that the average body temperature of all healthy US adults is between 97 and 99 degrees Fahrenheit. O d. We are 99% confident that the average body temperature of the 1000 adults in any randomly selected sample will be between 97 and 99 degrees Fahrenheit. e. If we were to select a new sample of 2000 adults and created a new confidence interval, the width of the new confidence interval would increase. V f. If we were to repeatedly take random samples of 1000healthy US adults and construct 99% confidence intervals with each sample, approximately 99% of these confidence intervals will contain the true average body temperature of all healthy US adults. Which of the following is not true about the T distribution? Select one: O . It is symmetric. Ob. It is bell-shaped. Oc. It is centered at 0. Od. As the degrees of freedom increase, the critical value t, for a 95% confidence interval will increase.

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