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On a survey conducted at a university, students were asked how they felt about their weight (about right, overweight, or underweight), and also were asked to record their grade point average (GPA). There were 235 responses, with 160 saying their weight was about right, 50 said they were overweight, and 17 underweight. The question of interest is whether mean GPA is the same or differs for different weight attitude populations. Minitab output for the study is given above. The mean square error (MSE) in this study is:
It is believed that population standard deviation is 15 days. If test is conducted using a 0.05 level of significance, what conclusion must be reached?
What is the possibility that for a arbitrarily selected customer the service time could exceed 3 minutes?
A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the company is currently producing has a normal distribution with an average of 7.5 minutes and a standard deviation of 1.2 minutes.
The mean amount of time a (unnamed) computer server is down is 18.3 minutes with a standard deviation of 5.7 minutes.
Using the 0.99 confidence coefficient, what are the confidence limits for the proportion that plan to vote for the Democratic incumbent.
If the manager decides to spend $3000 on advertising, based on the simple linear regression results given above, what would the estimated sales be?
Compare the unconditional probability of having the disease to the conditional probability of having the disease given the test says you have the disease.
Use the following data to write the normal equations of the linear regression between Y and X, and find the least squares regression.
Construct a scatterplot and identify the mathematical model that best fits the given data. Assume that the model is to be used only for the scope of the given gata, and consider only linear, polynomial (degree 2) logarithmic, exponential, and powe..
Use the least-squares method to compute the regression of coefficients b0 and b1.
State the null and alternative hypothesis if the average electric bill for residents of White Pine Estates exceeds $52.98 per month.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
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