Exam 6: Scatterplots, Association, and Correlation

The scatterplot shows monthly sales figures (in units) and number of months of experience For a sample of salespeople. The correlation between monthly sales and level of experience is most likely

Shown below is a correlation table showing correlation coefficients between stock price, Earnings per share (EPS) and price/earnings (P/E) ratio for a sample of 19 publicly traded Companies.Which of the following statements is false? $\text { Correlations: Stock Price, EPS, PE }$ Stock Price EPS EPS 0.875 PE 0.323 -0.111

A scatterplot of $\frac { 1 } { \sqrt { y } }$ vs. x shows a strong positive linear pattern. It is probably true that

A supermarket chain gathers data on the amount they spend on promotional material (e.g., Coupons, etc.) and sales revenue generated each quarter.The predictor variable is

For the following scatterplot, The likely correlation coefficient is

After conducting a survey of his students, a professor reported that "There appears to be a strong correlation between grade point average and whether or not a student looks at his or her phone during class." Comment on this observation.

A consumer research group examining the relationship between the price of meat (per pound) And fat content (in grams) gathered data that produced the following scatterplot. If the point in the lower left hand corner (2 grams of fat; $3.00 per pound) is removed, the Correlation would most likely

A study examined consumption levels of oil and carbon dioxide emissions for sample of Counties.The response variable in this study is

The National Sleep Foundation reported a moderately strong positive association between the number of hours of sleep a person gets and the person's ability to listen, learn, and solve problems. a.Explain in the context of this problem what "positive association" means. b.Hoping to improve academic performance, the professor recommends allowing students to take a nap prior to taking midterms and finals.Discuss the professor's recommendations.

A company's sales increase by the same amount each year.This growth is ...

A small independent organic food store offers a variety of specialty coffees.To determine Whether price has an impact on sales, the managers kept track of how many pounds of each Variety of coffee were sold last month. Based on the scatterplot, the linear relationship between number of pounds of coffee sold per Week and price is

Another company's sales increase by the same percent each year.This growth is …

The correlation coefficient between the hours that a person is awake during a 24-hour period And the hours that same person is asleep during a 24-hour period is most likely to be

On the axes below, sketch a scatterplot described: a. a strong positive association b. a weak negative association

All but one of the statements below contain a mistake.Which one could be true?

In a study of streams in the Adirondack Mountains, the following relationship was found Between the water's pH and its hardness (measured in grains).Is it appropriate to summarize The strength of association with a correlation?

The scatterplot shows monthly sales figures (in units) and number of months of experience For a sample of salespeople. The association between monthly sales and level of experience can be described as

The correlation between Hours Sleep and Quiz score of the 60 students in your statistics class Is r = -0.34.Which of these possible conclusions is justified:

The following scatterplot shows the relationship between the time (in seconds) it took men to run the 1500m race for the gold medal and the year of the Olympics that the race was run in: a.Write a few sentences describing the association. b.Estimate the correlation. $r =$ _________

All but one of these statements contain a mistake.Which could be true?