A real estate agent believes that the average closing cost of purchasing a new home is $6500 over the purchase price. She selects 40 new home sales at random and finds that the average closing costs are $6600. The standard deviation of the population is $120. Test her belief at a=0.05. Choices: Reject the null hypothesis. Do not reject the null hypothesis.

An additional data value is added to a dataset. The new value is far below the rest of the data. The standard deviation will decrease when this new value is added into the dataset. True False Suppose a certain drug causes kidney problems in 10% of patients, and this drug is to be tested on 55 patients. Find the standard deviation for the number of patients who will experience kidney problems.  2.2249 5.5 5.0 2.345

Insurance companies make bets. They bet that you’re going to live a long life. An insurance company offers a “death and disability” policy that pays average of $10,000 when you die with a standard deviation of $1,000 or pays average $5000 if you are permanently disabled with standard deviation of $1,000.  Assuming the distribution of the policy payout is normal. What percentage of pay will lie between payout of $7,000 and $9,000 when you die? What percentage of the payout will lie below $7,500 if you are permanently disabled? What percentage of the policy will lie above $8,100 when you die?

Consider a value to be significantly low if its z score less than or equal to −2 or consider a value to be significantly high if its z score is greater than or equal to 2.   A test is used to assess readiness for college. In a recent​ year, the mean test score was 21.4 and the standard deviation was 5.4. Identify the test scores that are significantly low or significantly high.   What test scores are significantly​ low? Select the correct answer below and fill in the answer​ box(es) to complete your choice.   A. Test scores that are between ____ and _____. (Round to one decimal place as needed. Use ascending​ order.)   B. Test scores that are less than _____. (Round to one decimal place as​ needed.)   C. Test scores that are greater than _____. ​(Round to one decimal place as​ needed.)

Consider a value to be significantly low if its z score less than or equal to −2 or consider a value to be significantly high if its z score is greater than or equal to 2.   A test is used to assess readiness for college. In a recent​ year, the mean test score was 20.7 and the standard deviation was 4.7. Identify the test scores that are significantly low or significantly high. What test scores are significantly​ low? Select the correct answer below and fill in the answer​ box(es) to complete your choice.     A. Test scores that are between nothing and nothing. ​(Round to one decimal place as needed. Use ascending​ order.)   B. Test scores that are greater than nothing. ​(Round to one decimal place as​ needed.)   C. Test scores that are less than nothing. ​(Round to one decimal place as​ needed.)   What test scores are significantly​ high? Select the correct answer below and fill in the answer​ box(es) to complete your choice.   A. TEST SCORES THAT ARE GREATER…

A college professor claims that the average cost of of a paperback textbook is greater than $27.50. A sample of 50 books has an average cost of $29.30. The standard deviation of the sample is $5.00. Test the claim at a=0.05 and find the p value for the test. Do we reject or do not reject

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Determine whether the statement is true or false. If it is false, rewrite it as a true statement. As the size of a sample increases, the standard deviation of the distribution of sample means increases. Choose the correct choice below. C OA. This statement is false. A true statement is, "As the size of a sample increases, the standard deviation of the distribution of sample means decreases." OB. This statement is true. OC. This statement is false. A true statement is, "As the size of a sample decreases, the standard deviation of the distribution of sample means decreases." OD. This statement is false. A true statement is, "As the size of a sample increases, the standard deviation of the distribution of sample means does not change." Time Remaining: 01:26:37

Use the range rule of thumb to identify the values that are significantly low, the values that are signficantly high, and the values that are neither significantly low nor significantly high. A test is used to assess readiness for college. In a recent year, the mean test score was 19.9 and the standard deviation was 4.7. Identify the test scores that are significantly low or significantly high. C What test scores are significantly low? Select the correct answer below and fill in the answer box(es) to complete your choice. (Round to one decimal place as needed.) O A. Test scores that are less than O B. Test scores that are between OC. Test scores that are greater than and (Round to one decimal place as needed. Use ascending order.) (Round to one decimal place as needed.) What test scores are significantly high? Select the correct answer below and fill in the answer box(es) to complete your choice. O A. Test scores that are greater than O B. Test scores that are less than O C. Test…

A researcher wishes to test the claim that the average cost of tuition and fees at a four year public college is greater than $5700. She selects a random sample of 36 four-year public colleges and finds the mean to be $5950. The population standard deviation is $659. Is there evidence to support the claim at  0.05? STEP 4. Conclusion. A. Reject the null hypothesis, there is enough evidence to support the alternate hypothesis. B. Do not reject the null hypothesis there is enough evidence to support the alternate hypothesis. C. Reject the null hypothesis, there is not enough evidence to support the alternate hypothesis. D. Do no reject the null hypothesis there is not enough evidence to support the alternate hypothesis. Enter the correct letter (A, B, C, D) only. Conclusion