Questions from Business Statistics

Q: Production yields vary and can be high or low on a given

Production yields vary and can be high or low on a given day. If they are high, you want to find out why so that yields could be similarly increased on other days. If they are low, you want to fix the...

Q: a. Why is a two-sided test appropriate for the

a. Why is a two-sided test appropriate for the previous problem? b. State the one-sided result of the two-sided test at the 5% level, if appropriate.

Q: a. Why is a two-sided test appropriate for the

a. Why is a two-sided test appropriate for the previous problem? b. State the one-sided result of the two-sided test at the 5% level, if appropriate. Data from Problem 5: Some of your advertisements...

Q: The least-squares prediction equation is, predicted costs = 35

The least-squares prediction equation is, predicted costs = 35.2+5.3 (items), with predicted costs measured in dollars. Find the predicted value and residual for a situation with costs of $600 and 100...

Q: Find the critical t value that would be used to construct the

Find the critical t value that would be used to construct the confidence interval for the slope coefficient in a regression analysis for each of the following situations: a. For 95% confidence, based...

Q: For the ages: Answer the parts of exercise 2.

For the ages: Answer the parts of exercise 2. Data from exercise 2: For the annual salary levels: a. Construct a histogram and indicate the average and standard deviation. b. How many employees are...

Q: For each of the scatterplots in Figs. 11.3.

For each of the scatterplots in Figs. 11.3.1–11.3.4, say whether the correlation is closest to 0.9, 0.5, 0.0, 0.5, or 0.9. Fig. 11.3.1: Fig. 11.3.4:

Q: Given the correlation r = 0.603 and the least-

Given the correlation r = 0.603 and the least-squares prediction equation Y = 38.2–5.3X, find the predicted value for Y when X is 15.

Q: Given the correlation r = 0.307 and the least-

Given the correlation r = 0.307 and the least-squares prediction equation Y = 55.6+18.2X, find the predicted value for Y when X is $25.

Q: One day your factory used $385 worth of electricity to produce

One day your factory used $385 worth of electricity to produce 132 items. On a second day, $506 worth of electricity was consumed to produce 183 items. On a third day, the numbers were $261 and 105. H...