For the given confidence interval, can you conclude that there is a difference between and ? Explain. 145.5 < 146.6 Since the value - = 0 ---Select--- in the confidence interval, it is ---Select--- that conclude that there is a difference in the two population means. - = 0. You ---Select--- Need Help? Read It Samples of 100 8-hour shifts were randomly selected from the police records for each of two districts in a large city. The number of police emergency calls was recorded for each shift. The sample statistics are listed below. Region 1 2 Sample Size 100 100 Sample Mean 2.7 3.4 Sample Variance 1.24 2.64 Find a 90% confidence interval for the difference in the mean numbers of police emergency calls per shift between the two districts of the city. (Use - 2. Round your answers to two decimal places.) calls per shift to calls per shift Interpret the interval. There is a 90% chance that for any two samples, one sample from region 1 and one sample from region 1, the difference between sample mean number of police emergency calls per 8-hour shift will fall within the interval. Hence, we are fairly certain that this particular interval contains a difference in the sample means from region 1 and region 2. 90% of all values from the populations in region 1 and region 2 will fall within the interval. Hence, we are fairly certain that this particular interval contains a difference in the sample means from region 1 and region 2. In repeated sampling, 10% of all intervals constructed in this manner will enclose the difference in the population mean number of police emergency calls per 8-hour shift between region 1 and region 2. Hence, we are fairly certain that this particular interval contains a difference in the population means from region 1 and region 2. In repeated sampling, 90% of all intervals constructed in this manner will enclose the difference in the population mean number of police emergency calls per 8-hour shift between region 1 and region 2. Hence, we are fairly certain that this particular interval contains a difference in the population means from region 1 and region 2. As a group, students majoring in engineering disciplines have the highest salary expectations, followed by those studying the computer science fields, according to the results of a study. To compare the starting salaries of college graduates majoring in electrical engineering and computer science, random samples of 60 recent college graduates in each major were selected and the following information obtained. Major Mean ($) SD Electrical Engineering 62,432 12,800 Computer science 57,865 13,730 (a) Find a point estimate for the difference in the average starting salaries (in dollars) of college students majoring in electrical engineering and computer science. (Use electrical engineering - computer science.) What is the 95% margin of error (in dollars) for your estimate? (Round your answer to two decimal places.) (b) Based upon the results in part (a), do you think that there is a significant difference in the average starting salaries for electrical engineers and computer scientists? Explain. Since the margin of error of the estimate of the difference - allows ---Select--- ---Select--- estimates, the mean expected salary for electrical engineering majors the mean for computer science majors.