Question

In: Statistics and Probability

The national average on a reading test is 72. The average for a sample of 80...

The national average on a reading test is 72. The average for a sample of 80 students in a certain geographical region who took the exam is 70. Is the average test score for students in this region statistically different from the national average? Find the P-value for the test. Assume a population standard deviation of 13.

Group of answer choices

0.0210

0.0419

0.1676

0.0838

0.3352

Solutions

Expert Solution

P value = 0.1676 ( from group choice ) PL??

orchestra answered 2 years ago
Next > < Previous

Related Solutions

The national average on a reading test is 72. The average for a sample of 80...
The national average on a reading test is 72. The average for a sample of 80 students in a certain geographical region who took the exam is 70. If the population standard deviation is 12, then test the claim that the average test score for students in this region statistically different from the national average. Let LaTeX: \alphaα =5% . State the claim: LaTeX: H_0\:\:\:\muH 0 μ ______ 72 LaTeX: H_1\:\muH 1 μ LaTeX: \ne≠72 claim Determine the direction of...
A random sample of 80 eighth grade​ students' scores on a national mathematics assessment test paper...
A random sample of 80 eighth grade​ students' scores on a national mathematics assessment test paper has a mean score of 269. This test result prompts a state school administrator to declare that the mean score for the​ state's eighth graders on this paper is more than 260 Assume that the population standard deviation is 31. At alphaαequals=0.06 is there enough evidence to support the​ administrator's claim? Complete parts​ (a) through​ (e). ​(a) Write the claim mathematically and identify Upper...
7. In the planning stage, a sample proportion is estimated as pˆp^ = 72/80 = 0.90....
7. In the planning stage, a sample proportion is estimated as pˆp^ = 72/80 = 0.90. Use this information to compute the minimum sample size n required to estimate p with 95% confidence if the desired margin of error E = 0.05. What happens to n if you decide to estimate pwith 90% confidence? (You may find it useful to reference the z table. Round intermediate calculations to at least 4 decimal places and "z" value to 3 decimal places....
*1. The national norm for third graders on a standardized test of reading achievement is a...
*1. The national norm for third graders on a standardized test of reading achievement is a mean score of 27 σ 4 . Rachel determines the mean score on this test for a random sample of third graders from her school district. (a) Phrase a question about her population mean that could be answered by testing a hypothesis. (b) Phrase a question for which an estimation approach would be appropriate. Needing problem 2 answered, but question 1 goes along with...
The average time students need to finish a particular test is 72 minutes with a standard...
The average time students need to finish a particular test is 72 minutes with a standard deviation of 12 minutes. (Assume that these times are normally distributed.) What is the probability that a randomly selected student will finish the exam in more than 75 minutes? If the professor wants 95% of students to have sufficient time to finish the test, how much time should she give them? What is the probability that a group of 20 students will take on...
The national average of college students on a test of sports trivia is 50 with a...
The national average of college students on a test of sports trivia is 50 with a standard deviation of 5. A sportscaster is interested in whether BC students know less about sports than the national average. The sportscaster tests a random sample of 25 BC students and obtains a mean of 48 Use an alpha level of 0.05. Is this a one-tailed or two tailed test?
The national average of college students on a test of sports trivia is 50 with a...
The national average of college students on a test of sports trivia is 50 with a standard deviation of 5. A sportscaster is interested in whether BC students know less about sports than the national average. The sportscaster tests a random sample of 25 BC students and obtains a mean of 48 Use an alpha level of 0.05. 1. State the z score(s) that form the boundaries of the critical region. Use an alpha level of 0.05. 2. Calculate the...
A sample of freshmen takes a reading comprehension test and their scores are summarized below. If...
A sample of freshmen takes a reading comprehension test and their scores are summarized below. If the mean for the general population on this test is m = 12, can you conclude that this sample is significantly different from the population. Test with a = .05. Sample Scores: 16, 8, 8, 6, 9, 11, 13, 9, 10 A. Find M= B.Find SS= C.Find standard error = D.Find t = E. Choose one: Reject H0 =1 Fail to Reject H0 =2
1) Assume that the national average score on a standardized test is 1010, and the standard...
1) Assume that the national average score on a standardized test is 1010, and the standard deviation is 200, where scores are normally distributed. What is the probability that a test taker scores at least 1600 on the test? Round your answer to two decimal places. _________________________________________ 2) Assume that the salaries of elementary school teachers in a particular country are normally distributed with a mean of $38,000 and a standard deviation of $4,000. What is the cutoff salary for...
In a certain state the recent average critical reading standardized test score was 481. Assume that...
In a certain state the recent average critical reading standardized test score was 481. Assume that the standard deviation is 50 and that standardized test scores are Normally distributed. Include an appropriately labeled and shaded Normal curve for each part. Complete Include a Normal curve for each part. a. What percentage of standardized test takers scored between 400 and 500? _______ b. What percentage of standardized test takers scored between 500 and 600? _______
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT