True or False In forming a 90 confidence interval for a population mean from a

# True or false in forming a 90 confidence interval for

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40.True or False: In forming a 90% confidence interval for a population mean from a sample size of 22, the number of degrees of freedom from the tdistribution equals 22. TYPE: TF DIFFICULTY: Easy KEYWORDS: confidence interval, mean, t distribution
41.True or False: Other things being equal, as the confidence level for a confidence interval increases, the width of the interval increases. TYPE: TF DIFFICULTY: Easy KEYWORDS: confidence interval, properties 42.True or False: The tdistribution allows the calculation of confidence intervals for means when the actual standard error is not known. TYPE: TF DIFFICULTY: Easy KEYWORDS: confidence interval, mean, t distribution 43.True or False: The tdistribution allows the calculation of confidence intervals for means for small samples when the population variance is not known, regardless of the shape of the distribution in the population. TYPE: TF DIFFICULTY: Easy KEYWORDS: confidence interval, mean, t distribution 44.True or False: For a tdistribution with 12 degrees of freedom, the area between – 2.6810 and 2.1788 is 0.980. TYPE: TF DIFFICULTY: Moderate KEYWORDS: t distribution 45.True or False: A sample of 100 fuses from a very large shipment is found to have 10 that are defective. The 0.95 confidence interval would indicate that, for this shipment, the proportion of defective fuses is between 0 and 0.28. TYPE: TF DIFFICULTY: Moderate
46.True or False: The sample mean is a point estimate of the population mean. TYPE: TF DIFFICULTY: Easy KEYWORDS: point estimate, mean 47.True or False: The confidence interval estimate of the population mean is constructed around the sample mean. TYPE: TF DIFFICULTY: Easy KEYWORDS: confidence interval, mean 48.True or False: The confidence interval estimate of the population proportion is constructed around the sample proportion. TYPE: TF DIFFICULTY: Easy KEYWORDS: confidence interval, proportion 49.True or False: A point estimate consists of a single sample statistic that is used to estimate the true population parameter. TYPE: TF DIFFICULTY: Easy KEYWORDS: point estimate 50.True or False: The confidence interval obtained will always correctly estimate the population parameter. TYPE: TF DIFFICULTY: Easy KEYWORDS: confidence interval, interpretation