A correlation of r = .79 is found between weekly sales of firewood and cough drops over a 1-year period. Which of the following is true? (a) There is a pretty strong positive linear relationship between sales of firewood and cough drops. (b) Fire must be the cause of coughing. (C) Temperature is a possible lurking variable that is behind this relationship. (d) Both (a) and (c) are true. (e) None of the above.

Question
A correlation of r = .79 is found between weekly
sales of firewood and cough drops over a 1-year
period. Which of the following is true?
(a) There is a pretty strong positive linear
relationship between sales of firewood and
cough drops.
(b) Fire must be the cause of coughing.
(C) Temperature is a possible lurking variable
that is behind this relationship.
(d) Both (a) and (c) are true.
(e) None of the above.
View transcribed image text
Expand

Expert Answer

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Math
Statistics

Correlation

Related Statistics Q&A

Find answers to questions asked by students like you.

Q: Pets In its monthly report, the local animal shelter statesthat it currently has 24 dogs and 18 cats...

A: Click to see the answer

Q: In a survery of 199 households, a Food Marketing Institute found that 65 households spend more than ...

A: Click to see the answer

Q: A custodian wishes to compare two competing floor waxes to decide which one is best. He believes tha...

A: Click to see the answer

Q: A botanist wishes to estimate the typical number of seeds for a certain fruit. She samples 44 specim...

A: Obtain the 99% confidence interval for the number of seeds for the species. The 99% confidence inter...

Q: You want to obtain a sample to estimate a population proportion. Based on previous evidence, you bel...

A: Obtain the sample size of a preliminary estimate for p with 0.70. The formula of sample size is, Us...

Q: Burgers II In the previous exercise you analyzed the as-sociation between the amounts of fat and sod...

A: Click to see the answer

Q: The state test scores for 12 randomly selected high school seniors are shown on the right. Complete ...

A: Click to see the answer

Q: Random variables Given independent random variableswith means and standard deviations as shown, find...

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are sol...

Q: Given that X̄=20, σ=9 and n=81, construct the following confidence intervals: the 98% confidence int...

A: Click to see the answer

Q: Assume that a sample is used to estimate a population proportion p. Find the 99.5% confidence interv...

A: The sample size n= 167 The sample proportion is 0.62. The confidence level is 99.5%. The absolute va...

Q: A city in the midwestern United States is consideringa plan to add roundabout intersections in some ...

A: The answer is (A). Calling between 12:00 and 12:30 limits his sampleto people who will be at home du...

Q: Suppose we observe 84 alcoholics with cirrhosis of the liver, of whom 29 have hepatomas—that is, liv...

A: It is given that n = 84 and p =0.24.

Q: Consider the following hypothesis test. H: o, 2 = 0. H: 0, 02 (a) What is your conclusion if n, = 21...

A: Obtain the value of the test statistic. The formula to obtain the value of the statistic is, The for...

Q: Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores ar...

A: The mean is 100 and the standard deviation is 15.

Q: A researcher is interested in finding a 90% confidence interval for the mean number minutes students...

A: Click to see the answer

Q: You are interested in finding a 95% confidence interval for the average commute that non-residential...

A: Given data and calculation for mean and standard deviation is shown below

Q: A manufacturing company produces water filters for home refrigerators. Thethe process has typically...

A: Click to see the answer

Q: You measure 29 turtles' weights, and find they have a mean weight of 70 ounces. Assume the populatio...

A: Click to see the answer

Q: Ho: p= 20 H1: H #20 X=21.5 s=5 n=25 and a=.01 The value of the Z or t-table is: 2.797 2.787 2.576 2....

A: State the hypotheses. That is, the population mean equals 20. That is, the population mean do not ...

Q: Dishwashers Dan’s Diner employs three dishwashers. Alwashes 40% of the dishes and breaks only 1% of ...

A: Let A represent person Al, B represent Betty and C represent Chuck. Also, D denotes that dish was br...

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe t...

A: Click to see the answer

Q: What price do farmers get for their watermelon crops? In the third week of July, a random sample of ...

A: The provided information is:

Q: You work for a marketing firm that has a large client in the automobile industry. You have been aske...

A: Solution: a. From the given information, confidence level is 0.98 and E=0.03. Since the proportion ...

Q: A smart phone manufacturer is interested in constructing a 99% confidence interval for the proportio...

A: Click to see the answer

Q: Last tank! For Exercise 2’s regression model predicting fuel economy (in mpg) from the car’s horsepo...

A: The regression model predicts the value of fuel economy from car’s horsepower. The se =3.287.

Q: Homeowners 2009 In 2009, the U.S. Census Bureaureported that 67.4% of American families owned theirh...

A: a. The data reports the survey taken by the U.S. Census Bureau studies the American families that ha...

Q: Rainmakers? In an experiment to determine whetherseeding clouds with silver iodide increases rainfal...

A: a. The data represents the summary statistics of rainfall produced for 26 clouds that are seeded wit...

Q: Assume that a sample is used to estimate a population proportion p. Find the 90% confidence interval...

A: Click to see the answer

Q: SAT Prep Can special study courses actually help raiseSAT scores? One organization says that the 30 ...

A: a. An organization states that there is an average gain of 60 points in the test of 30 students who ...

Q: The hexadecimal digits are as follows: 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F. How many different sequences...

A: Since, letters A, B, C, D, E, and F are the digits in terms of hexadecimal. Hence, there are 16 digi...

Q: Find the critical value and rejection region for the indicated t-test, level significance, and sampl...

A: Click to see the answer

Q: A forest ranger researching ecosystem recovery follow-ing forest fires collected data on a large gro...

A: 1 feet = 12 inches Mean =3.2 feet Standard deviation =0.6 feet

Q: In a recent election 57% of people supported reelecting the incumbent.  Suppose a poll is done of 13...

A: Given information- Probability of success, p = 0.57 No. of trial, n = 1350 Probability of failure, q...

Q: The mean weight of female dancers in a local modern dance company is more than 127 lbs. Express the ...

A: Solution: From the given information, the claim is that the mean weight of female dancers in a local...

Q: According to some law in genetics, when certain types of peas are crossed, the probability that the ...

A: Click to see the answer

Q: Assume that a sample is used to estimate a population proportion p. Find the 90% confidence interval...

A: Given:  

Q: It is known from past eperience that the probability that a person has cancer is 0.15 and the probab...

A: Click to see the answer

Q: Routine physical examinations of 400 preschool children reveleaed that 70 had dental problems, 60 ha...

A: Given: Total number of children = 400 Children with dental problems = 70 Children with vision proble...

Q: Deer mice are small rodents native to North America. Their adult body length are known to vary appro...

A: Click to see the answer

Q: You may need to use the appropriate technology to answer this question. Consider the following hypot...

A: Click to see the answer

Q: H0 :  µ= 60 H1 :  µ > 60  X̄=62    σ=10    n=100 and α=.05 The computed value of  Z (Zc ) or  t (...

A: Click to see the answer

Q: When should a regression model be used to make a prediction?

A: Using regression model to make prediction when Two variables should be measured on a continuous lev...

Q: How to find probabilities

A: Concept of probability: Probability deals with the likelihood of occurrence of a given event. The pr...

Q: If the alpha level is .05, then the confidence level is ?

A: Given: alpha = 0.05 confidence level / significant level = 1 - alpha

Q: Reading scores A class of fourth graders takes a diag-nostic reading test, and the scores are report...

A: Note: Thank you for the question. Since multiple subparts are posted, according to our policy, we ar...

Q: Save the grapes. Vineyard owners have problems withbirds that like to eat the ripening grapes. Some ...

A: Researchers have information about the save the grapes. The diagram displaying the design of experim...

Q: If n = 180 and X = 144, construct a 90% confidence interval for the population proportion, p.Give yo...

A: Solution: From the given information, X=144, n=180 and the confidence level is 0.90. The sample pro...

Q: According to the American Dental Association, 60% of all dentists use nitrous oxide in their practic...

A: Click to see the answer

Q: In a Japanese study, “researchers looked at 35 peoplewith lower back pain who were enrolled in an aq...

A: Solution: Answer for this question is A) this experiment proves that swimming causes a reduction in ...

Q: Hard water II The data set from England and Walesalso notes for each town whether it was south or no...

A: Click to see the answer

Transcribed Image Text

A correlation of r = .79 is found between weekly sales of firewood and cough drops over a 1-year period. Which of the following is true? (a) There is a pretty strong positive linear relationship between sales of firewood and cough drops. (b) Fire must be the cause of coughing. (C) Temperature is a possible lurking variable that is behind this relationship. (d) Both (a) and (c) are true. (e) None of the above.