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The maker of refrigerators buys bolts from two suppliers, and it is very important that the mean widths of the bolts received from both suppliers are equal since they must be used interchangeably. The refrigerator maker receives a large shipment of volts from each supplier and draws a random sample of 49 bolts from each shipment. The refrigerator maker wants to test whether the mean width is the same in both shipments.
a)State the Null and the Alternate Hypothesis:
b)Is the Alternate Hypothesis one-sided or two sided?
Suppose that the refrigerator manufacturer finds that the mean width of the bolts taken from the one shipment is 1.14 inches, and that the mean width of the bolts taken from the other shipment is 1.09 inches. The standard deviation of the widths of bolts in each 0.10 inches. Based on this experience, should the manufacturer reject the hypothesis that the mean widths are equal. Test the hypothesis at the .o5 significance level.
c)What is the test statistic?
d)What is your decision regarding Ho?
What can we say about the probability distribution of x? Is it approximately normal? What are the mean and standard deviation?
Set up hypothesis and two-tailed decision rule for right mean using 5% level of significance. Hypothesis for a two-tailed decision is?
A four-year university has decided to implement new approach to teaching Statistics. Full-time and adjunct professors were surveyed to determine whether they preferred the traditional lecture approach or a computer approach to teaching Statistics.
Find out the probability distribution, and the cumulative probability distribution of car arrivals.
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.
Randomly selected nonfatal occupational injuries and illnesses are categorized, according to the day of the week that they first occured, and the results are listed below.
Probability values based on normal distribution - What can you say about the shape of the distribution of sample mean and find the standard error of the distribution of the sample mean?
Pulte homes is developing two parcels near Medical Center in Houston, TX. In order to test different advertising approaches, they use different media to reach potential buyers.
When would you use a two population test with a small sample size at your place of employment, in your education, or in politics?
A probability value of .25 means that an event will occur:
Give null and alternative hypotheses for this test in symbolic form.
The sample was collected by interviewers going to people's homes in randomly chosen areas in each of the 9 countries. The population represented by this sample was:
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