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In a survey, respondents were asked to indicate their favorite brand of cereal (Post or Kellogg's). They were allowed only one choice. What is the probability concept that implies it is not possible for a single respondent to state both Post and Kellogg's to be the favorite cereal?
a.Concept of mutually exclusive events
b.Concept of independent events
c.Concept of dependent events
d.Concept of mutually inclusive events
A university found that 20 percent of its students withdraw without completing the introductory statistics. Assume that 20 students registered for the course.
Evette has 41 1/2ft. of string. She wants to cut it into pieces 3 3/4ft. long. How many pieces of string will she have? how much string remains, if any?
Find the third quartile Q3 of the list of 24 sorted values shown below. Which is relatively better: a score of 81 on a psychology test or a score of 50 on a economics test? Scores on the psychology test have a mean of 88 and a standard deviation of..
Standard deviation of 23.8 days. What is the 90% confidence interval for the average days worked by employees in all payroll departments?
The quality control department of Widgets Manufacturing needs your help. They can't decide which significance level is appropriate for testing the claim that fewer than 50% of widgets from a production run are defective.
Two cards are drawn successively and without replacement from an ordinary deck of playing cards. Compute the probability of drawing-- A heart on the first draw, a club on the second draw.
It was thought that hypnosis would lower a person's desire to smoke. A researcher decided to investigate this hypothesis using a paired-sample sign test in which the number of cigarettes/day smoked by subjects was recorded before and after hypnosi..
Using the spreadsheet for exercises 1-3, estimate how the population will change from this generation to the next under each of the following conditions.
What is the probability that the kickoff will go between 60 and 75 yards if the average kickoff is 50 yards with a variance of 49?
Perform a hypothesis test to determine if there is a significant correlation (α =0.05) between number of hours of overtime worked and hours of sleep
the director of an advertising agency is concerned with the effectiveness of a television commercial.what null
A department store, on average, has daily sales of $28,707.47. The standard deviation of sales is $1000. On Tuesday, the store sold $34,650.77 worth of goods. Find Tuesday's z score. Was Tuesday an unusually good day?
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