Question

1. Based on information from a large insurance company, 67% of all damage liability claims are made by single people under the age of 25. A random sample of 54 claims showed that 44 were made by single people under the age of 25. Does this indicate that the insurance claims of single people under the age of 25 is higher than the national percent reported by the large insurance company? Give the test statistic and your conclusion.

**a)** z = 2.263; fail to reject
*H*_{o} at the 5% significance level

**b)** z = -2.263; reject *H*_{o} at
the 5% significance level

**c)** z = -1.763; fail to reject
*H*_{o} at the 5% significance level

**d)** z = 2.263; reject *H*_{o} at
the 5% significance level

**e)** z = 1.763; reject *H*_{o} at
the 5% significance level

2. An auditor for a hardware store chain wished to compare the efficiency of two different auditing techniques. To do this he selected a sample of nine store accounts and applied auditing techniques A and B to each of the nine accounts selected. The number of errors found in each of techniques A and B is listed in the table below:

Errors in A | Errors in B |

27 | 13 |

30 | 19 |

28 | 21 |

30 | 19 |

34 | 36 |

32 | 27 |

31 | 31 |

22 | 23 |

27 | 32 |

Does the data provide sufficient evidence to conclude that the
number of errors in auditing technique A is fewer than the number
of errors in auditing technique B at the 0.01 level of
significance? Select the [Rejection Region, Decision of Reject
(RH_{0}) or Failure to Reject (FRH_{0})]. (Hint:
the samples are dependent)

**a)** [z < -2.9 and -z < -2.9,
FRH_{0}]

**b)** [t < -2.9, FRH_{0}]

**c)** [-t < 2.9 and t < 2.9,
RH_{0}]

**d)** [t > 2.9, FRH_{0}]

**e)** [t < -2.9 or -t < -2.9,
RH_{0}]

**f)** None of the above

Answer #1

**Solution:** 1. Based on information from a large
insurance company, 67% of all damage liability claims are made by
single people under the age of 25. A random sample of 54 claims
showed that 44 were made by single people under the age of 25. Does
this indicate that the insurance claims of single people under the
age of 25 is higher than the national percent reported by the large
insurance company? Give the test statistic and your conclusion.

**Answer: d)** z = 2.263; reject Ho at the 5%
significance level

2. Does the data provide sufficient evidence to conclude that the number of errors in auditing technique A is fewer than the number of errors in auditing technique B at the 0.01 level of significance? Select the [Rejection Region, Decision of Reject (RH0) or Failure to Reject (FRH0)]. (Hint: the samples are dependent)

**Answer:** **f)** None of the
above

n auditor for a hardware store chain wished to compare the
efficiency of two different auditing techniques. To do this he
selected a sample of nine store accounts and applied auditing
techniques A and B to each of the nine accounts selected. The
number of errors found in each of techniques A and B is listed in
the table below:
Errors in A
Errors in B
27
13
30
19
28
21
30
19
34
36
32
27
31
31...

An auditor for a hardware store chain wished to compare the
efficiency of two different auditing techniques. To do this he
selected a sample of nine store accounts and applied auditing
techniques A and B to each of the nine accounts selected. The
number of errors found in each of techniques A and B is listed in
the table below:
Errors in A
Errors in B
45
31
48
37
46
39
48
37
52
54
50
45
49
49...

The Toylot company makes an electric train with a motor that it
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deviation of s = 0.44 A. Do the data indicate that the
Toylot claim of 0.8 A is too low? (Use a 1% level of
significance.)
What are we testing...

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A. What are we testing in this problem?
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the mean current was x = 1.32 amps, with a sample standard
deviation of s = 0.43 amps. Perform a statistical test of the
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The Toylot company makes an electric train with a motor that it
claims will draw an average of only 0.8 ampere (A) under a normal
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The Toylot company makes an electric train with a motor that it
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This problem is based on information taken from The Merck
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