Ex 11.3.1

1. When the p-value is used for hypothesis testing, the null hypothesis is rejected if
p-value<\
\<p-value
p-value>\
p-value=\
None of the above answers is correct

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2. Which of the following does not need to be known in order to compute the p-value?
knowledge of whether the test is one-tailed or two tailed
hte value of the test statistic
the level of significance
All of the above are needed
None of the above answers is correct

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3. If a hypothesis is not rejected at the 5% level of significance, it
will also not be rejected at the 1% level
will always be rejected at the 1% level
will sometimes be rejected at the 1% level
Not enough information is given to answer this question
None of the above answers is correct

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4. A sample of 36 observations with sample mean 36 and

sample deviation 12 for testing the following hypotheses:

Ho: g20 v.s. Ha: g>20


(a) The standardized test statistic z equals

2.3
0.38
-2.3
-0.38
None of the above answers is correct

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(b) The p-value is
0.5107
0.0214
0.0107
2.1
None of the above answer is correct

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(c) If the test is done at 95% confidence, the null hypothesis should
not be rejected
be rejected
Not enough information is given to answer this question
None of the above answers is correct

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5. The manager of a 7-11 store has taken a random sample of 100 customers.

The average length of time it took the customers in the sample to check out was

3.1 minutes with a standard deviation of 0.5 minutes. We want to test to determine

whether or not the mean waiting time of all customers is significantly more than 3 minutes.

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(a) The standarized test statistic is

1.96
1.64
2.00
0.056
None of the above answers is correct

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(b) The p-value is
0.025
0.0456
0.05
0.0228
None of the above answers is correct

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(c) At 95% confidence, it can be concluded that the mean of the population is
significantly greater than 3
not significantly greater than 3
significantly less than 3
significantly greater than 3.18
None of the above answers is correct

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6. For a one-tailed test (upper tail) with a sample size of 900, the null hypothesis will

be rejected at 95% confidence if the standardized test statistic is

less than -1.645
greater than 1.645
less than 1.645
less than -1.96
greater than 1.96

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