A market researcher plans to sample sales receipts at

16) A market researcher plans to sample sales receipts at a natural food store to estimate
the average size (in dollars) of a customer purchase. Previous analysis suggests that
the standard deviation of the purchase amount is approximately $25.
In order to calculate a 95% confidence interval of total width less than $5, how many
sales records should the researcher include in her sample?

97

271

385

R
The answer cannot be determined from the information provided.
17)
Jaune Magazine (JM) must decide whether or not to publish a tell-all story about a celebrity.
If the story ends up having major impact, JM will realize substantial profits from additional
magazine sales, subscriptions, and advertising revenues. However, if JM publishes the story,
JM will face a lawsuit; if it loses the suit, the penalties could be substantial. The tree below
summarizes JM's decision.
The EMV of publishing the story is $10,000. Based on this EMV, JM should publish the story.
If the publisher chooses not to publish the story, which of the following best describes the
publisher's attitude towards this decision?

R
18) The regression analysis below characterizes the relationship between monthly ice
cream consumption (in pints per household) and the independent variables "average
monthly temperature" (in degrees Fahrenheit) and "average price" (in dollars per pint).
At a significance level of 0.05, which independent variables contribute significantly to
the consumption of ice cream?
R
19) The scatter diagram and regression line below
characterize the relationship between monthly ice
cream consumption (in pints per household) and the
independent variable "average monthly temperature"
(in degrees Fahrenheit).
The residual errors are defined as