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17 Cards in this Set
- Front
- Back
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The z-value that is used to construct a 95% confidence interval is
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1.96
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A 95% confidence interval for the mean can be interpreted to mean that
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If all possible samples are taken and confidence intervals are calculated, 95% of those intervals would include the true population mean somewhere in their interval. You can be 95% confident that you have selected a sample whose interval does include the population mean.
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In practice, the population mean is a known quantity that is to be estimated
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False
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The difference between the sample mean and the population mean is called the
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sampling error
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The value of alpha for a 98% confidence interval would be
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0.02
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The t distribution approaches the standardized normal distribution when the number of degrees of freedom
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increases
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Which of the following statements is false?
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Ho refers to a specified value of a sample statistic
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If an individual rejects a true null hypothesis, then she/he has possibly
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made a Type I error
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If a researcher wishes to determine whether there is evidence that the mean family income in the U.S. is greater than $30,000 then
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a one-tailed test should be utilized
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If the p-value is greater than alpha in a two-tailed test
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the null hypothesis should not be rejected
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By decreasing the sample size, the probability of committing a Type II Error is reduced
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False
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The region of rejection for a one-tailed test is
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found in the tail that supports the alternative hypothesis
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The one-way ANOVA is used to test statistical hypotheses concerning
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Means
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In a one-way ANOVA, the null hypothesis there is
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No treatment effect
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In a one-way ANOVA, if the computed F statistic exceeds the critical F value we may
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reject Ho since there is evidence of a treatment effect
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In order to calculate the F test statistic for a one-way ANOVA experiment you would use which of the following
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MSA/MSW
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The degrees of freedom for the F test in a one-way ANOVA are
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(c - 1) and (n - c)
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