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The Pennsylvania Refining Company is studying relationship between pump price of gasoline and number of gallons sold. For sample of 14 stations last Tuesday, correlation was 0.83. At 0.05 significance level, is correlation in population greater than zero?
Use the table to determine whether the correlations are significant and how you would interpret the results. The correlation between speed and strength for 20 women is .567. Test these results at the .01 level using a one-tailed test.
In the Distance problems, the kids are given a Rate (speed) that a vehicle is going, as well as a Time that the vehicle travels, and asked to calculate the Distance travelled. In the Rate problems they are asked to compute Rate from the other two ..
Suppose the federal government proposes to give a substantial tax break to automakers producing midsize cars that get a mean mileage exceeding 31 mpg.
What is the role of probability concepts in business decision making? Define probability concepts.
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho= 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
You're considering paying $5 to buy a ticket in a local lottery. You were told that 10,000 tickets will be sold. There are 5 prizes. The first prize is $5,000, the second is $1,000, the third is $500, the fourth is $100 and the last prize is $10.
Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
The personnel office at a large electronics firm regularly schedules job interviews and maintains records of the interviews. From the past records
The effectiveness of treating respiratory infections with herbal remedies was studied. "Days of fever" was used to measure effects. Among 356 children treated with herbal remedies, teh mean number of days with was 0.36,
We can think of this as the value of mew that maximizes f(y), the probability that our observed value of y occurs.
For what proportion of patients will drug be effective for between 2 and 2.25 hours?
Test whether there is a difference in the mean of times men and women and determine the p-value.
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