Statistical Analysis Lesson 7

Statistical Analysis Lesson 7
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Online Exam 8_07

Question 1 of 40
2.5 Points
A consumer group claims that the mean running time for a certain type of flashlight battery is not the same as the manufacturer’s claims. Determine the null and alternative hypotheses for the test described.

  A.
H0: µ = Manufacturer’s claims     Ha: µ < Manufacturer’s claims

  B.
H0: µ = Manufacturer’s claims     Ha: µ ¹ Manufacturer’s claims

  C.
H0: µ = Manufacturer’s claims     Ha: µ > Manufacturer’s claims

  D.
H0: µ ¹ Manufacturer’s claims     Ha: µ = Manufacturer’s claims

Question 2 of 40

If a fan purchased a bag with 30 peanuts, what is the lowest level at which this would be a significant event?



  A. 0.05
  B. 0.025
  C. 0.01
  D. It is not significant at any of the levels given

Question 3 of 40
2.5 Points
A researcher wants to check the claim that convicted burglars spend an average of 18.7 months in jail. She takes a random sample of 35 such cases from court files and finds that   months. Assume that the population standard deviation is 7 months. Test the null hypothesis that µ = 18.7 at the 0.05 significance level.

  A.
Do not reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months is supported.

  B.
Do not reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months cannot be supported.

  C.
Reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months is supported.

  D.
Reject the null hypothesis and conclude that the claim that the mean is different from 18.7 months cannot be supported.

Question 4 of 40
2.5 Points
A two-tailed test is conducted at the 5% significance level. What is the left tail percentile required to reject the null hypothesis?
  A. 97.5%
  B. 5%
  C. 2.5%
  D. 95%

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