1. Sixteen randomly sampled students were asked how many hours of video games th
ID: 3224332 • Letter: 1
Question
1. Sixteen randomly sampled students were asked how many hours of video games they played in the past week. x = 3.6 hr and s = 3 hr. What is the test statistic for testing whether the mean for all BYU students is lower than 6 h/week?
A. (3.6 – 6) / 4
B. (3.6 – 3) / 6
C. (3.6 – 6) / 0.75
D. (3.6 – 6) / 1.333
2. Sixteen randomly sampled students were asked how many hours of video games they played in the past week. x = 3.6 hr and s = 3 hr. For 95% confidence and 15 degrees of freedom, t* = 2.13. The stemplot was somewhat skewed to the right, with no outliers. What is the 95% confidence interval for ? A. 3.6 ± (2.13 × 3)
B. 3.6 ± (2.13 × 3/4)
C. 3.6 ± (2.13 × 3/16)
D. 3.6 ± (2.13 × 3 × 16)
3. A dairy scientist compared milk production of cows fed two diets. He randomly divided a set of 21 cows into two groups. One group was fed diet 1 for a month, and the other was fed diet 2 for a month.
Here are the milk-production results (lb/week):
group n x. s
diet 1 11 385.7 25.7
diet 2 10 398.2 43.1
4. What is the standard error of x1 x2?
A. 25.7÷11 + 43.1÷10
B. square root of 25.7÷11 + 43.1 ÷ 10
C. square root of 25.7^2 ÷11 - 43.1^2 ÷10
D. square root of 25.7^2 ÷11 + 43.1^2 ÷10
5. Using Option 2, the two-sample t statistic for this situation has an approximate t distribution with how many degrees of freedom?
A.. 9
B.. 10
C.. 18
D.. 20
Explanation / Answer
Answer:
1. Sixteen randomly sampled students were asked how many hours of video games they played in the past week. x = 3.6 hr and s = 3 hr. What is the test statistic for testing whether the mean for all BYU students is lower than 6 h/week?
A. (3.6 – 6) / 4
B. (3.6 – 3) / 6
Answer: C. (3.6 – 6) / 0.75
D. (3.6 – 6) / 1.333
2. Sixteen randomly sampled students were asked how many hours of video games they played in the past week. x = 3.6 hr and s = 3 hr. For 95% confidence and 15 degrees of freedom, t* = 2.13. The stemplot was somewhat skewed to the right, with no outliers. What is the 95% confidence interval for ? A. 3.6 ± (2.13 × 3)
Answer: B. 3.6 ± (2.13 × 3/4)
C. 3.6 ± (2.13 × 3/16)
D. 3.6 ± (2.13 × 3 × 16)
3. A dairy scientist compared milk production of cows fed two diets. He randomly divided a set of 21 cows into two groups. One group was fed diet 1 for a month, and the other was fed diet 2 for a month.
Here are the milk-production results (lb/week):
group n x. s
diet 1 11 385.7 25.7
diet 2 10 398.2 43.1
4. What is the standard error of x1 x2?
A. 25.7÷11 + 43.1÷10
B. square root of 25.7÷11 + 43.1 ÷ 10
C. square root of 25.7^2 ÷11 - 43.1^2 ÷10
Answer: D. square root of 25.7^2 ÷11 + 43.1^2 ÷10
5. Using Option 2, the two-sample t statistic for this situation has an approximate t distribution with how many degrees of freedom?
Answer: A.. 9 ( smaller sample size-1)
B.. 10
C.. 18
D.. 20
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.