Students who have completed a speed reading course have reading speeds that are normally distributed with a mean of 950 words per minute and a standard deviation equal to 220 words per minute.
Based on this information, what is the probability of a student reading at more than 1400 words per minute after finishing the course?A) 0.0202
B) 0.5207
C) 0.4798
D) 0.9798
Q. 2In estimating the difference between two population means, if a 95 percent confidence interval includes zero, then we can conclude that there is a 95 percent chance that the difference between the two population means is zero.
Indicate whether the statement is true or false
Q. 3The Cranston Hardware Company is interested in estimating the difference in the mean purchase for men customers versus women customers. It wishes to estimate this difference using a 95 percent confidence level.
Assume that the variances are equal and the populations normally distributed. The following data represent independent samples from each population:Men Women16.49 17.2133.34 17.4620.18 15.6526.39 10.6728.03 14.0726.02 19.6116.08 15.9032.27 11.1721.66 24.6632.32 13.3529.79 20.8733.37 22.57Based on these data, the company can conclude that there is a statistical difference between men and women with regard to mean spending at the hardware store with men tending to spend more on average than women. Indicate whether the statement is true or false
Q. 4The human resources department at a major high tech company plans to conduct an employee satisfaction study by sampling 100 employees from the 3,000 total employees.
They plan to use systematic random sampling since the employee file is in alphabetic order. The first employee selected in the study should be:A) the 30th employee.
B) employee 1 to 30 randomly selected.
C) employee 1 to 100 randomly selected.
D) the first employee.
Quick Reply
