Which statement is not true about confidence level? A.) 99 percent confidence interval procedure has a higher probability of producing intervals that will include the population parameter than a 95 percent confidence interval procedure. B.) a confidence interval between 20 percent and 40 percent means that population proportion lies between 20 percent and 40 percent. C.) an approximate formula for a 95 percent confidence interval which is equal to the sample estimate plus minus margin of error. D.) a confidence interval is an interval of value computed from the sample data that is likely to include the true population value. The z value which is used to construct a 99 percent confidence interval? A.) 1.28 B.) 1.645 C.) 1.96 D.) 2.575

A box model is used to calculate a confidence interval in the following scenario: One thousand high school students in a large city are randomly selected for a survey. Among these students, the average reported GPA is 3.0, and the SD is 1.22. For each of the following quantities in the box model, select the answer if the quantity is estimated, not known. Leave the quantities that are known unselected. a. the SD of GPA of high school students in the sample b. the average GPA of high school students in the sample c. the average GPA of all high school students in the city d. the SD of the tickets in the box

Two intervals are given, A and B, for the same value of the explanatory variable. A: 16.3 to 22.1; B: 17.8 to 20.6; (a) Which interval is the confidence interval for the mean response? B Which interval is the prediction interval for the response? A (b) What is the predicted value of the response variable for this value of the explanatory variable? Enter the exact answer.

A research center survey of 2,484 adults found that 1,942 had bought something online. Of these online shoppers, 1,295 are weekly online shoppers. Complete parts (a) through (c) below. a. Construct a 95% confidence interval estimate of the population proportion of adults who had bought something online. Sas (Round to four decimal places as needed.) led b. Construct a 95% confidence interval estimate of the population proportion of online shoppers who are weekly online shoppers. Sas (Round to four decimal places as needed.) c. How would the director of e-commerce sales for a company use the results of (a) and (b)? O A. Since a greater proportion of adults have purchased something online than are weekly online shoppers, the director of e-commerce sales may want to focus on those adults who have purchased something online. led O B. The information cannot be compared because it is derived from two different opinions. O C. Agreater proportion of adults have purchased something online, but…

10. Which one of the following statements about confidence intervals is false? A. Given the same sample of data, a 90% confidence interval will be narrower than a 95% confidence interval. B. The size of the population does not affect the width of a confidence interval. C. The population proportion determines the center of the confidence interval. D. The value of z* affects the width of a confidence interval. E. The general format of a confidence interval is “sample statistic ± margin of error.”

If a confidence interval is __________, this means the point estimate is not directly in the center of the interval. A. two-sided B. symmetric C. non-symmetric D. inferential

A confidence interval for a mean is (−13,14)-13,14. This interval would be wider if A.)The sample mean was larger or the variability of the data was larger. B.) The variability of the data was larger, or the investigator wanted to be more confident. C.) The investigator wanted to be more confident of their results, or there was more information. D.) The variability of the data was small, or the sample mean was larger. E.) None of the above.

The Confidence Interval: A. Does not include, or B. Includes   So the means before and after the treatment: A. Are different, or B. Could be the same   This result suggests that the drug treatment: A. Does not have, or B. has

Explain what "98% confidence" means in a 98% confidence interval, What does "98% confidence" mean in a 98% confidence interval? O A. If 100 different confidence intervals are constructed, each based on a different sample of sizen from the same population, then we expect 98 of the intervals to include the parameter and 2 to not include the parameter. O B. The probability that the value of the parameter lies between the lower and upper bounds of the interval is 98%. The probability that it does not is 2%. O C. The confidence interval includes 98% of all possible values for the parameter. O D. The value of the parameter lies within 98% of a standard deviation of the estimate. O Time Remaining: 02:19:13 Next MacBook Pro G Search or type URL esc & #3 %24 7 8 4 1 T Y