Question

In: Math

QUESTION 12 A teacher would like to estimate the mean grade for her class of 50...

QUESTION 12

  1. A teacher would like to estimate the mean grade for her class of 50 students on the most recent exam. After the first 10 tests are graded (in random order), her sample results are as follows:

    45 60 74 75 79 80 85 86 90 96

    Which of the numbers below represent the point estimate?

    A.

    15.4
    B.

    77.0
    C.

    84.0
    D.

    79.5

Solutions

Expert Solution

The point estimate is = (45 + 60 + 74 + 75 + 79 + 80 + 85 + 86 + 90 + 96)/10 = 77

Option - B is correct.

                                                                                                                                                     

                                                  

                                   

                          

                                              

                                                      

                                   

                                  

milcah answered 3 months ago
Next > < Previous

Related Solutions

(A-Grade) The operations manager of a large production plant would like to estimate the mean amount...
(A-Grade) The operations manager of a large production plant would like to estimate the mean amount of time a worker takes to assemble a new electronic component. Assume that the population standard deviation of time for this assembly is 3.6 minutes. 1. After observing 120 workers assembling similar devices, the manager noticed that their average time was 16.2 minutes. Construct a 92% confidence interval for the mean assembly time. 2. How many workers should be involved in this study in...
A teacher wanted to estimate the proportion of students who take notes in her class. She...
A teacher wanted to estimate the proportion of students who take notes in her class. She used data from a random sample of size n = 76 and found that 45 of them took notes. The 97% confidence interval for the proportion of student that take notes is:
On an examination in Biochemistry  12 students in one class had a mean grade of 78 with...
On an examination in Biochemistry  12 students in one class had a mean grade of 78 with a standard deviation of 6, while 15 students in another class had a mean grade of 74 with a standard deviation of 8. Using a significance level of 0.05, determine whether the first group is superior to the second group.
Question 1: A researcher would like to estimate the true mean number of hours adults sleep...
Question 1: A researcher would like to estimate the true mean number of hours adults sleep at night. Suppose that population sleep time is known to follow a Normal distribution with standard deviation as 1.5 hours. The researcher random select 100 people and found the average sleeping hours for the sample of 100 people is 6.5 hours. 1) Use this sample mean to estimate the true population mean of sleep time with 95% confidence. (hint: 95% CI) 2) If the...
A teacher gives a third grade class of n = 16 a vocabulary test at the...
A teacher gives a third grade class of n = 16 a vocabulary test at the beginning of the school year. To evaluate the changes that occur during the year, students are tested again at the end of the year. Their test scores revealed an average improvement of MD = 5.7 points with s2 = 144. Does this constitute a significant improvement? Use a one tail, related-samples t test with an alpha level of .05. a. Calculate Cohen's D (Round...
A teacher gives a third grade class of n = 16 a vocabulary test at the...
A teacher gives a third grade class of n = 16 a vocabulary test at the beginning of the school year. To evaluate the changes that occur during the year, students are tested again at the end of the year. Their test scores revealed an average improvement of MD = 5.7 points with s2 = 144. Does this constitute a significant improvement? Use a one tail, related-samples t test with an alpha level of .05. find standard error find degrees...
4th Grade (Class 1) 4th Grade (Class 2) 12 10 15 12 21 16 21 17...
4th Grade (Class 1) 4th Grade (Class 2) 12 10 15 12 21 16 21 17 22 17 22 19 22 19 25 22 26 22 27 22 27 27 31 28 32 29 33 29 33 31 36 31 37 31 38 33 41 33 43 37 44 39 45 43 45 43 47 47 55 49 57 57 The collected data is from two 4th grade (All female classes - Age 10) Fitnessgram pacer tests. Once you have...
Grade distribution: A statistics teacher claims that, on the average, 10% of her students get a...
Grade distribution: A statistics teacher claims that, on the average, 10% of her students get a grade of A, 24% get a B, 38% get a C, 18% get a D, and 10% get an F. The grades of a random sample of 100 students were recorded. The following table presents the results. A. Compute the expected frequencies B. List all of the grades which were given more often than expected separate by commas. The grades which were given more...
The operations manager of a large production plant would like to estimate the mean amount of...
The operations manager of a large production plant would like to estimate the mean amount of time a worker takes to assemble a new electronic component. After observing 135 workers assembling similar devices, the manager noticed that their average time was 16.0 minutes with a standard deviation of 3.7 minutes. Construct a 95% confidence interval for the mean assembly time. what is the margin of error of the confidence interval? new assume that the population standard deviation of assembly time...
The operations manager of a large production plant would like to estimate the mean amount of...
The operations manager of a large production plant would like to estimate the mean amount of time a worker takes to assemble a new electronic component. Assume that the standard deviation of this assembly time is 3.6 minutes. After observing 125 workers assembling similar devices, the manager noticed their average time was 16.2 minutes. Construct a 95% confidence interval for the mean assembly time.
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT