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You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 50 and a population standard deviation of 5 and a sample size of 25. Machine 2 has a sample mean of 52 and a population standard deviation of 6 with a sample size of 12. With an alpha of .01, Which of the following statements are true?
a. We can use 2.58 and -2.58 (or 2.57 and -2.57) as our critical values
b. We will use a z test.
c. we use 1.28 and -1.28 (or 1.27 and -1.27) as our critical values
d. A and B are correct
e. None of the above are correct
A new restaurant with 123 seats is being planned. Studies show that 57% of the customers demand a smoke free area. How many seats sould be in the non-smoking area in order to be very sure (mean + 3 Standard Deviation) of having enough seating ther..
A company adminsters an "aptitude test for managers" to aid in selecting new management trainees. Prior experience suggests that 60 percent of all applicants for management trainee positions would be successful if they were hired.
A tube of Listerine Tartar Control tooth paste contains 4.2 ounces. As people use the tooth paste, the amount remaining in any tube is random.
A quality control engineer wanted to estimate the mean weight (in grams) of M&M candies being produced on a certain machine in the factory. After collecting an appropriate random sample of M&M candies, he obtained the following weights:
The lifetime of a super tough AAA battery is normally distributed wit mean of 28.5 hours and standard deviation of 5.3 hours. For a battery selected at random
Some of the factors affect statistical power for a one sample t test. How does statistical power change (increase or decrease) for each of the following changes?
A sample of 49 pieces of cloth reveals a sample mean breaking strength of 69.1 pounds. State the null and alternative hypotheses.
A sociologist wants to determine if the life expectancy of people in Africa is less than the life expectancy of people in Asia.
Assuming 7 classes with a class interval width of 4, plot the data and construct a curve. What type of distrubtuion is indicated by the curve?
Assume that the population is 0.55. Compute the standard error of the sample proportion for the following sample sizes:
The following random sample was collected: 22 33 44 6 The 80% confidence interval for the mean is?
After a logarithmic transformation, we obtain the following regression result of Cobb-Douglas production formula for a firm:
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