STATISTICS

Answer the following questions with the choices:

Provide solutions and/or explanations.

1.

A report stated that 21% of babies are delivered by Caesarean section. A researcher believes that the percentage is less than 21% in the large hospital in his hometown. He randomly selected 50 newborn infants and found that 8 were born by Caesarean section. At a = 0.01, is there enough evidence to support his claim? The critical value of the test statistic is a. 2.3263 b. -2.3263 c. 2.5758 d. -2.5758A report by the Gallup Poll stated that on average a woman visits her physician is 5.3 times a year. A researcher At at = lll, can it he eenelutle-d that the average is still 5.8 visits per year? The appropriate test statistic that can be used is a. naesample Hest b. onesample artest e. nvmindependent samples ttest d. paired ttest A researcher claims that based on the information obtained from the Centers for Disease Control and Prevention, 11% of young people ages I 19 are obese. To test this claim, she randomly selected see people ages 2 19 and found that 42 were obese. At a = CLUE, is there enough evidence to reject the claim? The computed value of the test statistic is a. 1.49 h. 1.5:} c. 1.51 d- 1.54 The equation of the regression line used in statistics is a. x = a+ by b. y = bx + a c. y = a+ bx d. x = ay+bA random sample of monthly gasoline prices was taken from 2011 and from 2015. The samples are shown below. Using a = 0.01, can it be concluded that gasoline cost more in 2015? 2011 2.02 2.47 2.50 2.70 3.13 2.56 2015 2.36 2.46 2.63 2.76 3.00 2.85 2.77 The critical value of the test statistic is a. -2.718 b. 3.106 c. 2.718 d. -3.106