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A school counselor claims that he has developed a technique to reduce pre-studying procrastination in students. He has students time their procrastination for a week and uses this as a pretest (before) indicator of procrastination. Students then attend a workshop in which they are instructed to do a specific warming up exercise for studying by focusing on a pleasant activity. For the next week, students again time their procrastination. The counselor then uses the time from this week as the posttest (after) measure.Suppose the counselor found the sum of squared deviations from the mean of the sample to be 135. Given that he tested 10 people, what would the estimated population variance be?
A. 135/10=13.5B. 135/9=15.0C. 10/135=0.70D. 9/135=0.70
Explain how many cars would required to go by the speed trap to be 99.8% sure which at least one driver will warm oncoming traffic of the speed trap.
Farley purchases and pays for merchandise 60% in the month of acquisition and 40% in the following month. Accounts payable is used only for inventory acquisitions. How much cash will Farley receive during November?
Drive-up window is six per hour at noon on a typical monday. What percent is closest to the probability that exactly three customers arrive on a given noon hour on a typical monday?
What can we conclude from these figures at a level of significance of .01?
She surveys 100 randomly selected families and finds the mean income to be $96,321 with a standard deviation of $9555.With a0.05, is she correct?
x you then repeat this procedure three more times. you learned in class that u_x = u can you conclude that the mean of the four sample mean will be equal to the population mean, 65? why or why not?
Normally distributed with a mean of 852 and a standard deviation of 143. The proportion of days when at least 800 cars pass through the intersection is about?
If HIV virus is actually present, the probability that ELIA test will give a positive result from ELISA is .01. If ELISA has given a positive result, use the Bayes' theorem to find the probability that the HIV virus is actually present.
Let A be the event that a randomly chosen employee has a college degree and B the event that the chosen employee's income is more than $50,000.
At 0.05 significance level, is there a difference in the mean number of defects per shift? Assume that the populations are approximately normally distributed and the variances are equal.
A researcher conducts an independent measures research study and obtains t= 2.070 with df= 28. How many individuals participated in the entire research study?
Complete the table and answer the following questions. Use the .05 significance level.
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