#1. What is the correct interpretation of the following 95% confidence interval
ID: 3367645 • Letter: #
Question
#1.
What is the correct interpretation of the following 95% confidence interval for mean # of cruffins (hybrid croissant + muffin) sold at a bakery? 95% CI: (130,180)
The average number of cruffins is between 130 and 180, 95% of the time.
We are 95% confident that the average number of cruffins sold at the bakery is between 130 and 180.
We are 95% confident that the average number of cruffins sold at the bakery is less than 130 and greater than 180.
We are 100% confused about what a cruffin is
#2
A one-sample t-test that is two-tailed...
can be performed with either a p-value or confidence interval.
tests if the mean is different from, greater than, or less than a number.
uses a t and not a Z.
All of these
#3
An independent-samples t-test showed that there was a significant difference in mean # of donut holes eaten between group A and B (p-value was less than 0.05). The average # of donut holes eaten was 20 in group A and 30 in group B. The average difference (30-20=10) can be thought of as the practical significance.
a. True
b. False
A.The average number of cruffins is between 130 and 180, 95% of the time.
B.We are 95% confident that the average number of cruffins sold at the bakery is between 130 and 180.
C.We are 95% confident that the average number of cruffins sold at the bakery is less than 130 and greater than 180.
D.We are 100% confused about what a cruffin is
Explanation / Answer
1) Option - B is correct.
2) Option - D is correct.
3) False
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