Author Question: The scores on a standardized test are reported by the testing agency to have a mean of 70. Based on ... (Read 90 times)

meagbuch · **on:** Feb 14, 2020

Question 1

State University uses thousands of fluorescent light bulbs each year. The brand of bulb it currently uses has a mean life of 800 hours. A competitor claims that its bulbs, which cost the same as the brand the university currently uses, have a mean life of more than 800 hours. The university has decided to purchase the new brand if, when tested, the evidence supports the manufacturer's claim at the .05 significance level. Suppose 121 bulbs were tested with the following results:

Conduct the test using

Question 2

The scores on a standardized test are reported by the testing agency to have a mean of 70. Based on his personal observations, a school guidance counselor believes the mean score is much higher. He collects the following scores from a sample of 50 randomly chosen students who took the test.

39

48

55

63

66

68

69

70

71

73

74

76

77

78

79

80

82

83

85

86

88

89

90

91

92

93

95

96

97

99

Use the data to conduct a test of hypotheses at α = .05 to determine whether there is any evidence to support the counselor's suspicions.

af · **Reply #1 on:** Feb 14, 2020

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