Assume that credit card FICO scores are normally distributed. A sample of 18 individuals was taken and it was discovered that those 18 people had a mean credit score of 660.3 and a standard deviation of 95.9. Use a .05 level of significance to test the claim that the actual credit rating of a population has a mean less than 700. A medical researcher collected the systolic blood pressure reading for a random sample of 30 female students under the age of 21 who visited the Health Service. From this sample we find an average blood pressure of 116.33 and a standard deviation of 11.992. A prominent health administrator makes the claim that the mean systolic blood pressure of females under the age of 21 is less than 115. Test this claim at the .01 level of significance. What can you say about the claim? The local consumer watchdog group was concerned about the cost of electricity to residential customers of the New Zealand winter months. The local provider of electricity claims that the average cost of a winter power bill is $350 New Zealand Dollars. (Yes that is the actual currency of New Zealand. How boring.) This watchdog group to a sample of 25 power bills over the three months of June, July, and August and found the average cost to be $401.44 with a standard deviation of $80.06. Test this claim at the .05 level of significance. What can you say about the claim? Assume that it is known that the mean life span for American males is 69.5 years. A prominent Classical Music magazine makes the claim that the addition of classical music to your life will increase your life span. To test this claim, 35 conductors were sampled and were found to have a mean life span of 73.4 years with a standard deviation of 8.7 years. Test this claim at the .005 level of significance. Does this claim appear correct?
Assume that credit card FICO scores are
A medical researcher collected the systolic blood pressure reading for a random sample of 30 female students under the age of 21 who visited the Health Service. From this sample we find an average blood pressure of 116.33 and a standard deviation of 11.992. A prominent health administrator makes the claim that the mean systolic blood pressure of females under the age of 21 is less than 115. Test this claim at the .01 level of significance. What can you say about the claim?
The local consumer watchdog group was concerned about the cost of electricity to residential customers of the New Zealand winter months. The local provider of electricity claims that the average cost of a winter power bill is $350 New Zealand Dollars. (Yes that is the actual currency of New Zealand. How boring.) This watchdog group to a sample of 25 power bills over the three months of June, July, and August and found the average cost to be $401.44 with a standard deviation of $80.06. Test this claim at the .05 level of significance. What can you say about the claim?
Assume that it is known that the mean life span for American males is 69.5 years. A prominent Classical Music magazine makes the claim that the addition of classical music to your life will increase your life span. To test this claim, 35 conductors were sampled and were found to have a mean life span of 73.4 years with a standard deviation of 8.7 years. Test this claim at the .005 level of significance. Does this claim appear correct?
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