Quiz__Practice_Exam_2a_-_Highly_Recommended_but_Optional_42_Questions

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10/12/22, 7:43 PM Quiz: Practice Exam 2a - Highly Recommended but Optional (42 Questions) https://csufullerton.instructure.com/courses/3331590/quizzes/8290372/take?preview=1 1/19 Practice Exam 2a - Highly Recommended but Optional (42 Questions) This is a preview of the published version of the quiz Started: Oct 12 at 7:43pm Quiz Instructions The following 5 questions are based on this information. Suppose a random sample of 18 uber drivers was taken, and the average age x̄ of these drivers was found to be 27.5 years. Construct a 99% confidence interval for the mean age (µ) of all drivers. Assume that the age of drivers is normally distributed with a population standard deviation (σ) of 2.3 years. 1 pts Question 1 0.54 6.48 2.3 0.13 The standard error (SE) of x̄ is 1 pts Question 2
10/12/22, 7:43 PM Quiz: Practice Exam 2a - Highly Recommended but Optional (42 Questions) https://csufullerton.instructure.com/courses/3331590/quizzes/8290372/take?preview=1 2/19 0.005 2.58 0.01 2.32 The critical value (CV) used for a 99% interval estimate is 1 pts Question 3 27.5 ± 0.54 27.5 ± 1.26 27.5 ± 1.39 27.5 ± 2.3 The 99% confidence interval estimate of µ is 1 pts Question 4 Your claim is not statistically justified Your claim is statistically justified The company claims that average age of drivers is 26.9 years. In light of the sample evidence and at the 1% level of significance,
10/12/22, 7:43 PM Quiz: Practice Exam 2a - Highly Recommended but Optional (42 Questions) https://csufullerton.instructure.com/courses/3331590/quizzes/8290372/take?preview=1 3/19 1 pts Question 5 stays the same decrease increase be zero If we decrease the confidence level (1-α) from 0.99 to 0.95, the margin of error (ME) of the confidence interval estimate will The following 6 questions are based on this information. A large cycle company reported that in 2010, 65% of parents of children (between the ages of 8 to 12), bought their children a cycle. That same company has stated that cycle purchases for that same age group have gone up. They surveyed 300 parents of children and found that 230 of them have bought cycle to their children. 1 pts Question 6 H(0): p≤0.65 Versus H(a): p>0.65 H(0): p≥0.65 Versus H(a): p<0.65 Specify the null and alternative hypotheses. 1 pts Question 7
10/12/22, 7:43 PM Quiz: Practice Exam 2a - Highly Recommended but Optional (42 Questions) https://csufullerton.instructure.com/courses/3331590/quizzes/8290372/take?preview=1 4/19 0.058 0.037 0.028 0.047 The standard error (SE) of p¯ is The following 5 questions are based on this information. In 2017, it was reported that women sent on average 3,000 texts per month. It is believed that the number of texts sent has increased. In fact, a recent random sample of 60 women showed that they send an average 3,500 texts per month( ) with a sample standard deviation of 600 texts ( ). Assume that the random variable, number of texts sent by women(denoted by X ), is normally distributed. Is this sufficient statistical evidence to show that women are now sending on average more than 3000 texts per month? X¯=3,500 texts s=600 texts 1 pts Question 8 H(0): μ≤3,000 versus H(a): μ>3,000 H(0): μ≥3,000 versus H(a): μ<3,000 Specify the null and alternative hypotheses. 1 pts Question 9
10/12/22, 7:43 PM Quiz: Practice Exam 2a - Highly Recommended but Optional (42 Questions) https://csufullerton.instructure.com/courses/3331590/quizzes/8290372/take?preview=1 5/19 77.45 3.01 0.24 0.76 The standard error (SE) of x̄ is 1 pts Question 10 6.45 2.08 0.66 0.53 The test statistics value is 1 pts Question 11 0.999 0.301 0.000 0.973 The p-value is
10/12/22, 7:43 PM Quiz: Practice Exam 2a - Highly Recommended but Optional (42 Questions) https://csufullerton.instructure.com/courses/3331590/quizzes/8290372/take?preview=1 6/19 1 pts Question 12 We reject H(0) in favor of H(a) We do not reject H(0) At α=0.01 and using the p-value The following 5 questions are based on this information. Historically, the average number of boats owned by the people living in the coasts in a lifetime has been 12. An economist believes that the number is now lower because of recent economic downturns. A recent survey of 30 senior citizens indicates that the average number of boats owned over their lifetime is 10. Assume that the random variable, number of boats owned in a lifetime (denoted by X), is normally distributed with a standard deviation (σ) is 4.5. 1 pts Question 13 H(0): μ≥12 versus H(a): μ<12 H(0): μ≤12 versus H(a): μ>12 Specify the null and alternative hypotheses. 1 pts Question 14 The standard error (SE) of x̄ is
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