Question

A police officer is concerned about speeds on a certain section
of Interstate 95. The data accompanying this exercise show the
speeds of 40 cars on a Saturday afternoon.

Highway speeds

65 |

60 |

63 |

68 |

66 |

70 |

70 |

68 |

69 |

65 |

61 |

68 |

61 |

67 |

65 |

61 |

69 |

70 |

67 |

65 |

60 |

69 |

70 |

68 |

61 |

60 |

66 |

64 |

65 |

68 |

61 |

62 |

62 |

60 |

69 |

62 |

62 |

62 |

69 |

62 |

**a.** The speed limit on this portion of
Interstate 95 is 66 mph. Specify the competing hypotheses in order
to determine if the average speed is greater than the speed
limit.

*1)H*_{0}: *μ* = 66;
*H*_{A}: *μ* ≠ 66

*2)H*_{0}: *μ* ≥ 66;
*H*_{A}: *μ* < 66

*3)H*_{0}: *μ* ≤ 66;
*H*_{A}: *μ* > 66

**b-1.** Calculate the value of the test statistic.
**(Round your answer to 3 decimal places.)**

**b-2.** Find the *p*-value. Pick correct
answer

1)0.05 *p*-value < 0.10

*2)p*-value 0.10

*3)p*-value < 0.01

4)0.01 *p*-value < 0.020

5)0.020 *p*-value < 0.05

Answer #1

A police officer is concerned about speeds on a certain section
of Interstate 95. The data accompanying this exercise show the
speeds of 40 cars on a Saturday afternoon.
Highway Speed: 73 68 67 74 74 70 68 73 65 69 67 63 66 64 67 65
70 64 63 61 62 63 63 66 64 62 65 62 70 62 66 64 67 61 69 66 61 70
65 61
a. The speed limit on this portion of
Interstate...

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Compute a 95% confidence interval for the population mean height
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62 64 61 67 65 68 61 65 60 65 64 63 59
68 64 66 68 69 65 67 62 66 68 67 66 65
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81
82
72
94
52
57
59
66
51
54
62
80
52
77
74
85
51
89
62
57
73
35
61
64
62
87
80
74
80
79
63
62
63
67
97
76
43
60
85
65
72
86
66
85
73
69
72 ...

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62
62
80
67
70
62
56
66
86
71
79
63
68
64
67
64
62
73
74
71
68
70
69...

Question 9-15 are based on the random
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80
100
81
93
80
57
98
90
71
56
58
78
59
55
55
77
72
78
56
94
98
59
93
86
89
62
60
66
59
71
96
97
94
69
64
77
87
77
64
90
90
95
98
99
56
69
72
81
95...

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Unicom
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62
60
62
55
71
58
69
64
68
58
65
57
56...

You are currently working at NCLEX Memorial Hospital in the
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