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1. A random sample of 100 stores from a large chain of 1,000 garden supply stores was selected to determine the average number of lawnmowers sold at an end-of-season clearance sale. The sample results indicated an average of 6 and a standard deviation of 2 lawnmowers sold. Find the 95% confidence interval for the true population mean. Can we conclude that of all possible samples of 100 stores taken from the population of 1,000 stores, 95% of the confidence interval will contain the true population mean within the interval? Justify your answer.
2. A random sample of 10 observations is selected from the first normal population and 8 from the second normal population. For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are?
a) 18
b) 17
c) 16
d) None of the above
Define the rejection region. State the statistical decision.
Describe a specific application of statistics that either has a direct effect on you or your life.
A college student is taking 5 courses in a semester. He is willing to assume that he will get an A with probability 0.10, a B with probability 0.80, and a C with probability 0.1 in each of the courses. He defines X1, X2, and X3 to be the number of..
Would it be reasonable to conclude that the 5 percent of the employees are not able to pass the random drug test?
Draw a simulation experiment for car agency and simulate using fleet of four rental cars for 10 days.
Compute the variance and standard deviation
Determine the value of the finite population correction factor if population size is 1000 and the sample size is 300? What is the smallest sample size for which finite population correction factor must be Used?
The quality-control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of eight syringes taken from the batch. Assume the batch contains 1% defective syringes.
State the hypotheses for a right-tailed test.
The manager of Sandy Corporation wants to determine whether or not the type of work schedule for her employees has any effect on their productivity. She has selected 15 production employees at random and then randomly assigned 5 employees to each ..
An SRS of 100 of a certain popular model car in 1993 found that 20 had a certain minor defect in the brakes. An SRS of 400 of this model car in 1994 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of t..
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
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