74) Dr. Jordan operates a dental practice with 315 patients and she would like to estimate the proportion of her patients that have dental insurance from their employers. A random sample of 110 patients found that 40 had insurance coverage. The 95% confidence interval to estimate the proportion of patients with dental insurance is ________.
A) (0.227, 0.501)B)(0.291, 0.437)C) (0.327, 0.401)D) (0.346, 0.383)
75) Dr. Jordan operates a dental practice with 315 patients and she would like to estimate the proportion of her patients that have dental insurance from their employers. A random sample of 75 patients found that 30 had insurance coverage. The 90% confidence interval to estimate the proportion of patients with dental insurance is ________.
76) John Charleston owns a heating oil delivery company that services 1,540 residences. John would like to estimate the number of customers that have oil storage tanks that are less than 100 gallons in capacity. A random sample of 200 customers found that 63 had an oil tank that was less than 100 gallons. The 80% confidence interval to estimate the proportion of customers with oil tanks less than 100 gallons is ________.
77) John Charleston owns a heating oil delivery company that services 1,540 residences. John
would like to estimate the number of customers that have oil storage tanks that are less than 100 gallons in capacity. A random sample of 200 customers found that 48 had an oil tank that was
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less than 100 gallons. The 99% confidence interval to estimate the proportion of customers with oil tanks less than 100 gallons is ________.
78) If the purpose of the hypothesis test is to establish that a population parameter is equal to or not equal to a specific value, the ______________________________________.
A)equality statement is always assigned to the null hypothesisB) equality statement is always assigned to the alternative hypothesisC) ≠ statement is always assigned to the null hypothesisD) ≤ or ≥ statement is always assigned to the alternative hypothesis
79) A professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics exam is equal to 45 minutes. The correct hypothesis statement would be ______________________.
80) A professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics exam is equal to 45 minutes. A Type I error would occur if the professor concludes that the average exam time is _________________________________.

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