- Vi Fi Access A Survey Of 46 Students In Grades 4 Through 12 Found 68 Have Classroom Wi Fi Access Find The 95 Confiden 1 (14.97 KiB) Viewed 20 times
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Telephone Calls A researcher knew that before cell phones, a person made on average 2.5 calls per day. He believes that the number of calls made per day today is higher. He selects a random sample of 30 individuals who use a cell phone and asks them to keep track of the number of calls that they made on a certain day. The mean was 2.7. At a=0.1, Is there enough evidence to support the researcher's claim? The standard deviation for the population found by a previous study is 0.9. Assume that the variable is normally distributed. Use the P-value method with tables. Part: 0/5 Part 1 of 5 State the hypotheses and identify the claim. HO: (Choose one) H: (Choose one) The hypothesis test is a (Choose one) V test,
A Daily Driving The average number of miles a person drives per day is 24. A researcher wishes to see if people over age 60 drive less than 24 miles per day. She selects a random sample of 32 drivers over the age of 60 and finds that the mean number of miles driven is 23.4. The population standard deviation is 3.7 miles. At a=0.10, is there sufficient evidence that those drivers over 60 years old drive less than 24 miles per day on average? Assume that the variable is normally distributed. Use the P-value method with tables. no he Part: 0/5 Part 1 of 5 allo State the hypotheses and identify the claim. HO: (Choose one) H: (Choose one) The hypothesis test is a (Choose one) test
Many people believe that the average number of Facebook friends is 135. The population standard deviation is 36.1. A random sample of 30 high school students in a particular county revealed that the average number of Facebook friends was 146. At a=0.01, is there sufficient evidence to conclude that the mean number of friends is greater than 135? Part 1 of 5 State the hypotheses and Identify the claim with the correct hypothesis. HO: H = 135 not claim HH > 135 claim This hypotheses test is a one-tailed v test,
Soft Drink Consumption A researcher claims that the average yearly consumption of soft drinks per person is 52 gallons. In a sample of 54 randomly selected people, the mean of the yearly consumption was 53,9 gallons. The standard deviation of the population is 3.5 gallons. On the basis of the P-value, is the researcher's claim valid at a=0.10? Part 1 of 5 State the hypotheses and identify the claim. Ho: H = 52 claim H: #52 not claim olo The hypothesis test is a two-tailed test.
Copy Machine Use A store manager hypothesizes that the average number of pages a person copies on the store's copy machine is less than 40. A sample of 42 customers' orders is selected. At a= 0.05, is there enough evidence to support the claim using the P-value method? Assume o -30.9. 24 113 9 3 72 36 80 17 70 37 9 17 21 5 51 4 85 3 2 1 61 58 122 2 8 82 21 2 42 9 49 2 3 2 36 5 15 1 43 27 6 61 Send data to Excel Part 1 of 5 State the hypotheses and identify the claim. H: 11 -40 not claim HH <40 claim The hypothesis test is a one-tailed test.
Sick Days in Bed A researcher wishes to see if the average number of sick days a worker takes per year is greater than 5. A random sample of 28 workers at a large department store had a mean of 5.6. The standard deviation of the population is 1.2. Is there enough evidence to support the researcher's claim at a=0.012 Assume that the variable is normally distributed. Use the P-value method with tables. Part 1 of 5 State the hypotheses and identify the claim. H = 5 not claim H: > 5 claim This hypothesis test is a one-tailed test.
Weight Loss of Newborns An obstetrician read that a newborn baby loses on average 7 ounces in the first two days of his or her life. He feels that in the hospital where he works, the average weight loss of a newborn baby is less than 7 ounces. A random sample of 32 newborn babies has a mean weight loss of 6.5 ounces. The population standard deviation is 1.7 ounces. Is there enough evidence at a=0.01 to support his claim? Assume that the variable is normally distributed. Use the P-value method with tables. Part 1 of 5 State the hypotheses and identify the claim. H: 1 - 7 not claim Hu<7 claim The hypothesis test is a one-tailed test
Dress Shirts in a previous study conducted several years ago, a man owned on average 16 dress shirts. The standard deviation f the population is 3. A researcher wishes to see if that average has changed. He selected a random sample of 43 men and Dund that the average number of dress shirts that they owned was 15.2. At a=0.10, Is there enough evidence to support the laim that the average has changed? Assume that the variable is normally distributed. Use the P-value method with tables. Part 1 of 5 State the hypotheses and identify the claim. Hu - 16 not claim H: #16 claim The hypothesis test is a two-tailed test. Part: 1 / 5 Part 2 of 5 Compute the test value. Always round z score values to at least two decimal places.
Breaking Strength of Cable A special cable has an average breaking strength of 800 pounds. The standard deviation of the population is 12 pounds. A researcher selects a sample of 22 cables and finds that the average breaking strength is 794 pounds. Can he reject the claim that the breaking strength is 800 pounds? Use the P-value method with a=0.01 level of significance. Assume that the variable is normally distributed Part 1 of 5 State the hypotheses and identify the claim. Ho u = 800 claim H: 1800 not claim The hypothesis test is a two-tailed test. Part: 1/5 Part 2 of 5 Compute the test value. Always round 2 score values to at least two decimal places.