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A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled and the average error from the industry standard is calculated. The results are presented below.
The researcher is interested in determining whether there is evidence that the two processes yield different average errors. Assume that the population standard deviations are equal.
What is the null hypothesis?
What four steps should be used in evaluating expressions? Could these steps be skipped or rearranged? Explain your answersr.
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
Suppose that the two lists are combined to produce a new list of 18 values. What is the average (mean) of this new list?
A sample of seed packets was selected, and their weights in grams were recorded as follows: 15.1, 15.6, 15.8, 15.1, 15.5, 15.9, 15.5, 15.2. Determine a 90% confidence interval for the mean weight of seeds in all packets.
The random variable x is known to be uniformly distributed between 1.0 and 1.5.
Chi-square tests are great to show if distributions differ or if two variables interact in producing outcomes. What are some examples of variables that you might want to check using the chi-square tests? What would these results tell you?
For each of the following, identify the scale of measurement (NOIR) and the best measure of central tendency for the data.
What is the standard deviation of the sampling distribution of p(hat) the proportion of all rolls of the die that show a 1 or a 2? 3.) describe the shape of the sampling distribution of p(hat).
Utilizing jacobian method finding the probability density function. Utilizing either the CDF method or Jacobian method illustrate the probability density function of Y is given.
Ten pairs of points yielded a correlation coefficient of 0.790. If α = 0.05, which of the following statements is correct if H0 = ρ0?
Two independent samples of sizes n1 = 50 and n2 = 50 are randomly selected from two populations to test the difference between the population means. The sampling distribution of the sample mean difference, is:
Select the level of significance, and determine critical, ZCR value.
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