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STA101 Statistics For Business

tag 0 Download 4 Pages / 810 Words tag 06-11-2020
  • Course Code: STA101
  • University: Elite Education Institute
    icon is not sponsored or endorsed by this college or university

  • Country: Australia



Prof. Hardtack gave four Friday quizzes last semester in his 10-student senior tax accounting class. Quiz 1:

60, 60, 60, 60, 71, 73, 74, 75, 88, 99 Quiz 2: 65, 65, 65, 65, 70, 74, 79, 79, 79, 79 Quiz 3: 66, 67, 70, 71, 72, 72, 74, 74, 95, 99 Quiz 4: 10, 49, 70, 80, 85, 88, 90, 93, 97, 98

(a) Find the mean, median, and mode for each quiz.
(b) Do these measures of center agree? Explain.
(c) For each data set, note strengths or weaknesses of each statistic of center.
(d) Are the data symmetric or skewed? If skewed, which direction? (e) Briefly describe and compare student performance on each quiz.


In a sample of 100 Planter's Mixed Nuts, 19 were found to be almonds.

(a) Construct a 90 percent confidence interval for the true proportion of almonds.
(b) May normality be assumed? Explain.
(c) What sample size would be needed for 90 percent confidence and an error of ± 0.03?
(d) Why would a quality control manager at Planter's need to understand sampling?


Consider the following Excel regression of perceived sound quality as a function of price for 27 stereo speakers.

(a) Is the coefficient of Price significantly different from zero at a = .05?
(b) What does the R2 tell you?
(c) Given these results, would you conclude that a higher prise implies higher sound quality?


Suppose a pickup and delivery company states that their packages arrive within two days or less on average. You want to find out whether the actual average delivery time is longer than this. You conduct a hypothesis test.

(a) Set up the null and alternative hypotheses.
(b) Suppose you conclude wrongly that the company's statement
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