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Create a Histogram of the following data:
Calculate the average student score necessary for the district to retain its federal funding. You may assume that the Standard Deviation will not change. This will require some thought. Think of the z
A random sample of 16 pharmacy customers showed the waiting times below (in minutes). Find a 90 percent confidence interval for μ, assuming that the sample is from a normal population.
Dr. Stallter has been teaching basic statistics for many years. She knows that 80 percent of the students will complete the assigned problems.
A multiple choice test consists of 25 questions with possible answers of a, b, c, d, and e. Estimate the probability that with random guessing, the number of correct answers is between 3 and 10 inclus
IQ scores are normally distributed with a mean of 100 and a std dev of 15. If 25 people are randomly selected for an IQ test, find the probably that their mean score is between 95 and 105.
A researcher has a series of Likert-scaled items and a measure of frequency of absenteeism. He uses each of the Likert-scaled items in a separate bivariate correlation with absenteeism without testing
A football team's season ticket sales, percentage of games won, and number of active alumni for the years 1992-2000 are given below:
Suppose Abraham Lincoln had answered a survey questionnaire in which he indicated that he had not received a grade school diploma.
Finding appropriate z- and t-scores is important when constructing confidence intervals. Confidence intervals allow one to estimate important population parameters such as population mean, population
Bob enjoys making candy and some friends have encouraged him to open a candy-making business. To see if the local citizens buy enough candy,
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will
You are a researcher who conducted a study of soft-drink preferences among residents in a test market prior to an advertising campaign for a new cola product. Of the participants, 130 are teenagers an
A state meat inspector in Iowa has been given the assignment of estimating the mean net weight of packages of ground chuck labeled “3 pounds.” Of course, he realizes that the weights canno
A sample of 25 concession stand purchases at the May 12 matinee of Spider-Man 3 showed a mean purchase of $ 7.29 with a standard deviation of $ 3.02. For the May 18 evening showing of the same movie.
To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in.
In Dallas some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 143, 348 runs and had 20 accidents, while the flee
Interpret the following SPSS computer output for the chi-square test. Variable COMMUTE is “How did you get to work last week?” Variable GENDER is “Are you male or female?
Collapse the response categories in the following table so that it meets the assumption of the chi-square test; then perform the test.
Perform a chi-square test on the following data (a) Regulation is the best way to ensure a safe workplace.
An Excel Spreadsheet is reprinted below. Interpret the t-test results. Are they statistically significant?
The managers in a company’s East and West regions were rated on the basis of the company’s evaluation system. A researcher wishes to conduct a t-test of means to determine if there is a di
Test the hypothesis of no differences for average payback period (years) necessary to justify solar heating systems for residences.
A personnel manager has a computer-generated list of all employees that indicates that 70 percent are full-time employees, 20 percent are part-time employees, and 10 percent are furloughed or laid-off
One-half of a sample receives an incentive in a mail survey. The other half does not. A comparison of response rates is desired.