Pearson eText Business Statistics: First Course -- Instant Access (Pearson+)
8th Edition
ISBN: 9780136880974
Author: David Levine, David Stephan
Publisher: PEARSON+
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A drug company claims that an allergy medication causes headaches in 5% of those who take it.A medical researcher believes that more than 5% of those who take the drug actually get headaches.
Identify the population(s):
All individuals who take the medication.
The proportion of those who take the drug who get a headache.
What is the variable being examined for individuals in the population(s)?
Whether or not an individual who does not take the drug gets a headache.
Whether or not an individual takes the correct dosage of the drug.
Whether or not an individual who takes the drug gets a headache.
Is it categorical or quantitative?
[Proportions are Categorical. Mean values are Quantitative.]
Categorical
Quantitative
Identify the parameter(s):
The proportion of those who take the drug who get a headache.
The mean amount of medication taken.
The number individuals who take the medication.
What kind of hypotheisis test is this?
1 population mean
2 population means
2…
The histogram below gives the length of service of members of the Department of Chemistry at a particular university. The classes, in years of service, are 0−−4.9, 5−−9.9, etc., and the vertical axis represents the number of faculty.
(a) What percent of the department faculty have 25 or more years of service?
(b) If a member of the department is chosen at random to serve on a university committee, what is the probability (in decimal form) that the chosen representitive will have between 5 and 35 years of service?
(c) What is the probability the representative above will have less than 30 years of service given that the person has less than 35 years of service?
A case-control study was conducted to examine the association between lung cancer and smoking in men. The case group contains 500 patients, who were diagnosed with lung cancer. Five hundred age-matched patients were recruited as controls. The study found that 50% of cases were regular smoking and the proportion is 20% among controls.
a. Create a 2x2 table based on the given information
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- Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales. To document this assertion, Mr. McWhinney gathered the following sample information. The x column indicates the number of client contacts last month and the y column shows the value of sales ($ thousands) last month for each client sampled. Number of Contacts, x Sales ($ thousands), y 14 24 12 14 20 28 16 30 46 80 23 30 48 90 a. Find the value of correlation coeffecient (r) : b. What is the regression equation : = + x c. Determine the estimated sales if 40 contacts are made.arrow_forwardFor an article in a magazine, 20 different vehicles were selected to obtain data for comparison. From each vehicle the price in dollars, the fuel economy (in miles per gallon), the number of doors, the type of vehicle (car, truck, SUV, other), and if it had all wheel drive or not. a. What are the cases? b. List the variables and identify them as quantitative or categorical.arrow_forwardThe Consumer Reports Restaurant Customer Satisfaction Survey is based upon 148,599 visits to full-service restaurant chains (Consumer Reports website, February 11, 2009). Assume the following data are representative of the results reported. The variable type indicates whether the restaurant is an Italian restaurant or a seafood/steakhouse. Price indicates the average amount paid per person for dinner and drinks, minus the tip. Score reflects diners’ overall satisfaction, with higher values indicating greater overall satisfaction. A score of 80 can be interpreted as very satisfied. Restaurant Type Price ($) Score Bertucci's Italian 16 77 Black Angus Steakhouse Seafood/Steakhouse 24 79 Bonefish Grill Seafood/Steakhouse 26 85 Bravo! Cucina Italiana Italian 18 84 Buca di Beppo Italian 17 81 Bugaboo Creek Steak House Seafood/Steakhouse 18 77 Carrabba's Italian Grill Italian 23 86 Charlie Brown's…arrow_forward
- A consumer research company wants to estimate the average cost of an airline ticket for a round trip within the continental United States. A random sample of 50 airfares was gathered giving an average price of $438. Identify the variable. A. Random sample of 50 airfares C. Consumer research company B. Airline Fare D. Quantitative E. $38arrow_forwardIn a study looking at undergraduate students’ perceptions of sense of community at their university, a researcher hypothesizes that the farther away students live from campus (in miles), the less they feel they are part of the university community. The researcher collected data for the following two variables – miles from campus and part of community (rating from 1-10 of how much they felt part of the university community). Proposed analysis (the kind of test) and why you chose the analysis: Scales of measurement (i.e., nominal, ordinal, interval or ratio) for variable(s) that will be used in the analysis: Null and alternative hypotheses (based on context of study) in symbols: Test assumptions and make a decision Inferential statistic(s) and p-value(s): Decision: conclusion Based on your decision, identify and explain the type of error you could be making with respect to the conclusions of the studyarrow_forwardA student survey was conducted at a major university, and data were collected from a random sample of 750 undergraduate students. One variable that was recorded for each student was the student's answer to the question: "What region of the country did you live in just prior to enrolling in this Northeast/Southeast/Northwest/Southwest/Midwest/Outside the U.S." university? These data would be best displayed using which of the following? A. O IQR B.O Boxplot C.O Histogram D. Stemplot E. O Pie chartarrow_forward
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