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A recent survey of gasoline prices indicated that the national avedrage was $4.098 per gallon. The Dallas Automobile Club claimed that gasoline in Texas was significantly lower than the national average. A survey covering 0 different suburbs in Dallas found the average price of gasoline to be $3.924 per gallon with a population standard deviation of $0.053. What critical value shoiuld be used to test the claim using a = 0.01?a) 1.26
b) 2.33
c) -1.26
d) -2.33
The monthly sales volume (in thousands of dollars) for a manufacturer of snow skis is seasonal (there tend to be more skis sold during fall and winter months than during warmer months). The following table shows the monthly seasonal indexes for th..
If absolute value of test statistic is less than critical value in hypothesis test decision is to?
John conducted his study to measure self-esteem among victims of domestic violence before and after they complete an 8-week program for abuse victims with 10 individuals. He calculated t = 1.9 from his data.
Note that under the exponential assumption, P(X>t) = exp(-t/theta). If t=5, use the result from (a) to find an approximate one-sided lower 95% confidence limit for theta.
A statistics professor would like to determine whether students in the class showed improved performance on the final exam as compared to the midterm examination.
Based on a scatter diagram, would you estimate the linear correlation coefficient to be:
For the data shown below, prepare a x-bar chart. Note that the sample size is three. Record the values for the UCL, center line, and LCL. In addition, note any points that are out of control.
Can we conclude that mean time for game is less than 3.50 hours? Use.05 significance level.
A local group claims that the police issue more than 60 speeding tickets a day in their area.
Health and Nutrition Examination Survey, suppose that weights of men now are normally distributed with mean of m =172 pounds and standard deviation of s = 29 pounds.
Use a test of the difference between proportions when answering these questions.
Any analysis required to check the required conditions (note that if you find that you cannot meet the required conditions for the test you expected to do, you must use the appropriate non-parametric test)
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