Over the past year, XYZ Inc. has conducted a sales training program at its call centre. The company selected a simple random sample of 15 sales representatives to evaluate the effectiveness of this program. The evaluation recorded answers to the question (Do you feel comfortable cold calling to a prospect over the phone?) in the pre/post surveys of the training program. Based on these answers, what are the proportions (percentages) of sales representatives that feel comfortable in cold calling before and after the sales training? Submit A. 0.3 and 0.5 B. 0.8 and 0.4 C. 0.2 and 0.4 D. 0.2 and 0.6 Hide Table SALES REPRESENTATIVE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 COMFORTABLE IN COLD CALLING BEFORE TRAINING No No No Yes No No Yes No No No No No No Yes No COMFORTABLE IN COLD CALLING AFTER TRAINING Yes Yes Yes Yes No Yes Yes No No Yes No No No Yes Yes

Any basketball fan knows that Shaquille O'Neal, one of the NBA's most dominant centers of the last twenty years, always had difficulty shooting free throws. Over the course of his career, his overall made free-throw percentage was 53.3%. During one off- season, Shag had been working with an assistant coach on his free-throw technique. During the next season, a simple random sample showed that Shaq made 26 of 39 free-throw attempts. Test the claim that Shaq has significantly improved his free-throw shooting using a 0.05 significance level. Check the conditions of the Central Limit Theorem for this scenario. Calculate the number of expected successes.

The Institute of Education Sciences measures the high school dropout rate as the percentage of 16- through 24-year-olds who are not enrolled in school and have not earned a high school credential. In 2009, the high school dropout rate was 8.1%. A polling company recently took a survey of 1000 people between the ages of 16 and 24 and found 6.5% of them are high school dropouts. The polling company would like to determine whether the dropout rate has decreased at a 5% significance level. reject HO we can conclude that the high school dropout rate has decreased reject HO we cannot conclude that the high school dropout rate has decreased do not reject HỒ we cannot conclude that the high school dropout rate has decreased do not reject HỒ we can conclude that the high school dropout rate has decreased

A community college professor is interested in determining the relationship between the number of posts students make on Schoology and their respective grades. He planned to correlate the results from a sample from all his classes, however, due to time constraints, he decided to sample only from students with high grades. As his statistical consultant, state whether or not you support his plans and why.

Houston North Hospital is trying to improve its image by providing a positive experience for its patients and their relatives. Part of the "image" program involves providing tasty, inviting patient meals that are also healthful. A questionnaire accompanies each meal served, asking the patient, among other things, whether he or she is satisfied or unsatisfied with the meal. A 100-patient sample of the survey results over the past 7 days yielded the following data: Day 1 234 5 6 7 The control limits to include 99.73% of the random variation in meal satisfaction are: No. of Unsatisfied Patients ZNORDRH 22 22 6 15 10 28 17 UCLp = = .284 (enter your response as a number between 0 and 1, rounded to three decimal places). LCLp (enter your response as a number between 0 and 1, rounded to three decimal places). Sample Size 100 100 100 100 100 100 100