**STAT 200 OL4 US2 Sections Final Exam Spring 2015 Complete Solution answersA+++**

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- Variance represents the average of the squared difference from the mean. Variance 0 means all values are same as mean which indicates identical values. Thus the statement is true.

- As there is no common region between A and A
^{c}so P(A and A^{c}) = 0 and thus the given statement is false.

- As the normal distribution is symmetric about the mean so the mean and median is the same value and thus the given statement is true.

- For 99% confidence interval we need a larger Z or t-value (or any other value as appropriate) to multiply with standard error to find out the confidence interval. Thus the statement is correct.

- Smaller significance level gives larger critical value and hence rejecting the null hypothesis becomes more difficult so the given statement is false.

- The obtained table is given below,

Checkout Time (in minutes) |
Frequency |
Relative Frequency |

1.0 - 1.9 |
4 |
4/25 = 0.16 |

2.0 - 2.9 |
25*0.4 = 10 |
0.4 |

3.0 - 3.9 |
25-(4+10+5)= 6 |
6/25 = 0.24 |

4.0 - 4.9 |
5 |
5/25 = 0.20 |

Total |
25 |
1 |

**Category:**Business, General Business

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