Doctor would perform a chi square test to test her

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doctor would perform a chi-square test to test her research hypothesis. In that case, what is the test value that she would compute. Place your answer, rounded to 3 decimal places, in the blank. For example, 34.567 would be a legitimate entry. 42.980
Question 15 of 20 1.0/ 1.0 Points Accepted characters : numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. A statistician wishes to test the claim that the standard deviation of the weights of firemen is less than 25 pounds. To do so, she selected a random sample of 20 firemen and found s = 23.2 pounds. Assuming that the weights of firemen are normally distributed, if the statistician wanted to test her research hypothesis at the .05 level of significance, what is the critical value? Place your answer, rounded to 3 decimal places, in the blank. For example, 12.345 would be a legitimate entry. 10.117
Question 16 of 20 1.0/ 1.0 Points Accepted characters : numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. The ABC battery company claims that their batteries last 100 hours, on average. You decide to conduct a test to see if the company's claim is true. You believe that the mean life may be different from the 100 hours the company claims. You decide to collect data on the average battery life (in hours) of a random sample of n = 20 batteries. Some of the information related to the hypothesis test is presented below. Test of H 0 :
Question 17 of 20 1.0/ 1.0 Points Accepted characters : numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. At a university, the average cost of books per student has been \$550 per student per semester. The Dean of Students believes that the costs are increasing and that the average is now greater than \$550. He surveys a sample of 40 students and finds that for the most recent semester their average cost was \$630 with a standard deviation of \$120. What is the test value for this hypothesis test? Test value: 4.22 Round your answer to two decimal places as necessary.
Part 3 of 3 - 3.0/ 3.0 Points Question 18 of 20 1.0/ 1.0 Points An alternative or research hypothesis is usually the hypothesis a researcher wants to prove.
Question 19 of 20 1.0/ 1.0 Points A one-tailed alternative is one that is supported by evidence in either direction. True False Answer Key: False
Question 20 of 20 1.0/ 1.0 Points If a null hypothesis about a population proportion p is rejected at the 0.025 level of significance, then it must also be rejected it at the 0.05 level.
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