Students at a local middle school were randomly selected to participate in a reading comprehension program. The program is designed to increase their reading comprehension. A total of 21 students each took a pretest before the program and posttest after the program. The mean differences in the posttest and pretest is 24. The administration decided that all students in the school would participate in the program next school year. Let µA denote the mean score of the posttest and µB denote the mean score of the pretest for all students in the school. The 98 percent confidence interval estimate of the difference between the means for all students is (17, 31). What is an appropriate interpretation of the confidence interval?
a |
For any µA and µB with (µA µB) ≥ 23, the sample result is quite likely. |
b |
µA is greater than µB, with a probability of 0.98. |
c |
µA is less than µB, with a probability of 0.98. |
d |
For any µA and µB with 17 < (µA − µB) < 31, the sample result is quite likely. |
e |
µA is approximately 31 and µB is approximately 17. |
Students at a local middle school were randomly selected to participate in a reading comprehension program....
3. We have testified 10 students who joined the summer library program and got their reading comprehension score, mean = 145, and standard deviation is 2.5. What is the confidence interval of 95%? (2 points)
A school administrator is interested in estimating the proportion of students in the district who participate in community service activities. From a random sample of 100 students in the district, the administrator will construct a 99 percent confidence interval for the proportion of all district students who participate in community service activities. Which of the following statements must be true? A)The population proportion will be in the confidence interval. b)The probability that the confidence interval will include the population proportion...
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The answers are marked but I need them explained.
A new program designed to improve high school student reading comprehension has been launched in a major school district. Students can choose how many hours they spend participating in the program, as an alternative to some other elective courses. A researcher is interested in a possible linear relationship between the number of hours a student spends taking part in the program (X) and standardized reading test scores (Y). 100 students were...
(e) A teacher instituted a new reading program at school. After
10 weeks in the program, it was found that the mean reading speed
of a random sample of 21 second grade students was 92.7 wpm. What
might you conclude based on this result? Select the correct choice
below and fill in the answer boxes within your choice.(Type
integers or decimals rounded to four decimal places as
needed.)
The reading speed of second grade students in a large city is...
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