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The owner of a chain of ice cream stores would like to study the effect of atmospheric temperature on sales during the summer season. A sample of 21 consecutive days is selected, with the following results (Hint: Determine which are the independent and dependent variables)Temperature Sales63 1.5270 1.6873 1.875 2.0580 2.3682 2.2585 2.6888 2.990 3.1491 3.0692 3.2475 1.9298 3.4100 3.2892 3.1787 2.8384 2.5888 2.8680 2.2682 2.1476 1.98a. Assuming a linear relationship, use the least-square method to find the regression coefficients b0 and b1.b. Predict the sales per store for a day in which the temperature is F.c. Plot the residuals versus the independent variable by using Excel. (Shown in the Excel file)d. Draw the normal probability plot by using Excel. (Shown in the Excel file)e. Based on the results of (c) and (d), is there reason to question the validity of the model?
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, & 10.
Find the probability that you will (a.) make your first sale on your fifth call, (b.) make your sale on the first, second or third call, and (c.)do not make a sale on your first three calls.
How large a sample is needed in order to be 98% confident that the sample proportion will not differ from the true proportion by more than 6%?
Then estimate demand again with a weighted moving average in which sales in the most recent year are given a weight of 2 and sales in the other two years are each given a weight of 1.
While 290 out of 400 in Batavia preferred the same flavor. To test the hypothesis that there was no difference in preferences in the two towns, what is the alternate hypothesis?
What is the probability that 0, 1, 2, or 3 hypertensives will be identi ed in such sibships if the hypertensive status of 2 siblings in the same family are independent events?
Find out the suitable critical value(s) for this situation given a 0.05 significance level. Find out/compute the value of sample test statistic.
Grindit & Floggit Ltd. make customized Widgets at a cost of $150 per unit of which 3% (on average) happen to be out of tolerance. Up to 115 Widgets can be produces in one continuous run whose set up incurs an additional cost of $10 000.
When finding percentiles, if locator L is not whole number, one procedure is to interpolate so that locator of 23.75, for instance.
What is the probability of either X or Y occurring? What is the probability that neither X nor Y will happen?
Find a 95% confidence interval for the percentage of girls and women in Taiwan who had antibodies at that time.
The number of viewers of American Idol has a mean of 33 million with a standard deviation of 10 million. What is the probability that next week's show will: Have between 37 and 44 million viewers?
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