Whenever the population standard deviation is unknown and the population has a

Whenever the population standard deviation is unknown

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Whenever the population standard deviation is unknown and the population has a normal or near-normal distribution, which distribution is used in developing an interval estimation? T-distribution As the sample size increases, the margin of error? Decreases What type of error occurs if you fail to reject H0 when, in fact, it is not true? Type II In general, higher confidence levels provide? Wider confidence interval. In order to test the following hypotheses at an a level of significance, H0: u_< 100, Ha u> 100, the null hypothesis will be rejected if the test statistic Z is? _> Za The level of significance? Is (1-confidence interval) Which of the following does not need to be in order to compute the p-value? The level of significance If the hypothesis is not rejected at the 5% level of significance, it? Will also not be rejected at the 1% level A sample of 20 items from a population with an unknown o is selected in order to develop an interval estimate of u. which of the following is not necessary? The sample must have a normal distribution When the level of the confidence decreases, the margin of error? Become smaller Problem Solving 1.) According to an annual consumer spending survey, the average monthly Bank of American Visa credit card charge was \$1838 (U. S. Airways Attach Magazine, December 2003). A sample of monthly credit card charges provides the following data. 238 720 1251 825 450 116 135 333 584 387 991 396 170 428 1616 a. Compute the mean and the median.

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• Summer '18
• David Grimmett

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