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Create a categorical variable from a quantitative variable. Consider the study described in Example 4.3. Some analyses compared three groups of students. The students were classified as having optimal sleep quality (a PSQI of 5 or less), borderline sleep quality (a PSQI of 6 and 7), or poor sleep quality (a PSQI of 8 or more). When the three groups of students are compared, is the PSQI being used as a quantitative variable or as a categorical variable? Explain your answer and describe some advantages to using the optimal, borderline, and poor categories in explaining the results of a study such as this.
Bay area community college (BACC) has collected data comparing the starting salaries of their graduating students with last names beginning with the letters A through M with those whose last names begin with N through Z.
The temperature dataset on the companion website gives y 5 mean April temperature (Fahrenheit) and x = geographic latitude for 20 U.S. cities.
A citizens' group interested in generating public and financial support for a new university basketball arena has published a questionnaire in area newspaper. Readers return the questionnaire by mail.
your body mass index bmi is your weight in kilograms divided by the square of your height in meters. many online bmi
Suppose the police stop a driver because the gun detects speeding. What is the probability that the driver was actually driving below the speed limit? (Round your answer to 4 decimal places.)
A manufacturing firm has two suppliers for an electrical component used in its process: one in Mexico and one in China.
Calculate the sales-volume variance and flexible-budget variance for operating income - compute price and efficiency variances for direct materials and direct manufacturing labor.
Find a 98% con?dence interval for the variance σ2 of rates of return. Use this to ?nd the con?dence interval for the population standard deviation, σ.
A figure showing each score and the number of times each score occurred is a: (a) histogram
A large medical center's oncology program reported in increased # of cases of pancreatic cancer during a certain month.
Remember that a resistant statistic is a numerical summary whose value is not unduly influenced by an outlier of any magnitude.
a presidential candidate plans to begin her campaign by visiting the capitals in 4 of 47 states. what is the
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