Exam 26: Exploring and Collecting Data

For families who live in apartments the correlation between the family's income And the amount of rent they pay is r = 0.60. Which is true? I. In general, families with higher incomes pay more in rent. II. On average, families spend 60% of their income on rent. III. The regression line passes through 60% of the (income$, rent$) data Points.

Below is a stem and leaf display of prices for a sample homes recently sold in a Metropolitan area in the southeastern region of the U.S. Stem-and-Leaf Display: Home Prices Stem-and-leaf of Home Prices $N=13$ Leaf Unit $=10000$ 4 1 5788 (4) 2 0123 5 2 89 3 3 0 2 3 5 1 4 0 Which of the following statements is true?

A recent survey of online shoppers asked them to indicate the primary reason they Shop via the Internet. The table summarizes responses by reason and gender. What Percent of males cite Convenience as the primary reason they shop online? Reason for Shopping Online Male Female Convenience 249 90 Better Prices 110 99 Greater Selection 41 211

A regression analysis of company profits and the amount of money the company spent on advertising produced a $\mathrm { R } ^ { 2 } = .72$ . Which of these is true? I. This model can correctly predict the profit for $72 \%$ of companies. II. $\quad 72 \%$ of the variance in company profit can be accounted for by the model. III. On average, companies spend about $72 \%$ of their profits on advertising.

In their October 2003 issue, Consumer Reports evaluated the price and Performance of 23 models of cordless phones. Computer output gives the summary Statistics for the prices ($) shown in the table. Based on these results, which of the Following is true? Min Q1 Median Q3 Max Mean SD 15 30 50 110 200 71.75 52.08

A researcher is conducting a study on eating disorders. Using a list of recent Participants in the online Weight Watchers program, she randomly selects a sample from The alphabetized list. This list represents the

A researcher is conducting a study to determine how knowledgeable teenagers are About making good food choices. She decides to interview teenagers eating at a fast food Restaurant. The results may be biased because this is a

What scale of measurement is type of workplace injuries (slip and fall, stress Related, etc.)?

A manufacturer of batteries routinely tests its products to determine lifetime (hours of continuous usage). Suppose they select a sample of 30 AAA batteries and find That the average lifetime is 1500 hours. This is a

A correlation of zero between two quantitative variables means that

A recent survey of online shoppers asked them to indicate the primary reason they Shop via the Internet. The table summarizes responses by reason and gender. What Percent of respondents who cited Greater Selection as the primary reason they shop Online were females? Reason for Shopping Online Male Female Convenience 249 90 Better Prices 110 99 Greater Selection 41 211

Which is true for the data shown in the histogram? I. The distribution is skewed to the right. II) The mean is probably smaller than the median. III) It is appropriate to summarize these data with the mean and standard deviation.

The U.S. Bureau of Labor Statistics publishes the monthly CPI (consumer price Index). This index shows the change in prices paid by urban consumers for a market Basket of goods and services. These data are

In listing a property, real estate agencies provides information on a number of Variables. Which of the following variables related to property listings is categorical?

A government agency has 6000 employees. As an alternative to the traditional Five day work week, employees were asked whether they preferred a four day work week (10 hours per day) or flexible hours. The segmented bar chart below is based on the data Collected. Which of the following statements is true about work week preferences and Age category?

If a parameter is computed from a set of data, which of the following statements is True?

Which is true of the data shown in the histogram? I. The distribution is approximately symmetric. II) The mean and median are approximately equal. III) The median and IQR summarize the data better than the mean and standard Deviation.

An office supply chain has stores in two locations, Dayton and Scranton. One of These stores is to be closed within the coming year, and to help make the decision, Management reviews sales data. Below are boxplots for monthly unit sales for both Locations. Which of the following statement is not correct?

A customer service center keeps track of the number of complaints received each Day about one of their new products. The numbers of complaints received over the last 11 day period are 19, 18, 22, 21, 17, 18, 22, 19, 16, 23, and 25. The median for this Sample of data is

Suppose a sample of 60 business majors revealed that the average time spent Studying per week is 22 hours with a standard deviation of 4 hours. For one student Reporting that he studies 16 hours per week, the corresponding z score is