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The speed of cars (mph or miles/hour) on CA-60 freeway follows a normal distribution. A highway safety researcher believes that cars on CA-60 travel at an average speed of 70 mph. From a sample of 11 vehicles driving on the highway, he finds the sample average speed to be 74.5 mph with a sample standard deviation of 9 mph.
a. Use a t-test to verify his belief
b. Suppose that the population standard deviation is known to be 15. Use a suitable test at 5% level of significance to verify the hypothesis mentioned in part (a). Explain.
Calculate the coefficient of determination, given that the linear correlation coefficient, r, is -0.625. What does this tell you about the explained variation and the unexplained variation of the data about the regression line?
Suppose an engineer proposes a new model that will weigh 3100 pounds. What could we expect the miles per gallon in the city performance would be?
In a regression analysis, three independent variables are used in the equation based on a sample of forty observations. What are the degrees of freedom associated with the F-statistic?
A large population of overdue bills has balances that follow a normal curve. When we take a sample of 100 of these the average is $500 and the standard deviation is $100. (a) what statement can you make about the range $300 to $700? (b) what state..
according to an airline a particular flight is on time 95 of the time. suppose 10 flights are randomly selected and the
Women have been on a diet within the past 12 months. Using Normal approximation, what is the probability (±0.001) that 76% or more of the women in the sample have been on a diet?
1. you earned a 7.1 nominal rate of return on your investments over the past year. but at the same time the reported
1.in the table below we examine the relationship between final grade and the reported hours per week each student said
At the .05 level of significance, is there evidence of a difference in variability in the shipping time between the two outlets? What decision should the carpet manufacturer make?
Suppose that an automobile manufacturer designed a radically new lightweight engine and wants to recommend the grade of gasoline to use.
Sample data in a goodness-of-fit test are compared with __________. A. a predetermined or historical standard for the variable being studied
In a clinical study of an allergy drug, 108 of the 203 subjects reported experiencing significant relief from their symptoms. Using a significance level of .01, test the claim that more than half of all those using the drug experienced relief.
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