In a sample of 13 randomly selected high school seniors, the mean score on a standardized test was 1185 and the standard deviation was 160.7. Further research suggests that the population mean score on this test for high school seniors is 1016. Does the t-value for the original sample fall between - to 90 and to 90? Assume that the population of test scores for high school seniors is normally distributed. The t-value of t=3.64 does not fall between - to 90 and to 90 because to 90 =- (Round to two decimal places as needed.)

In a random sample of 10 cell​ phones, the mean full retail price was ​$507.20 and the standard deviation was ​$194.00. Further research suggests that the population mean is ​$426.53. Does the​ t-value for the original sample fall between −t0.95 and t0.95​? Assume that the population of full retail prices for cell phones is normally distributed.   The​ t-value of t=enter your response here ▼     fall between −t0.95 and t0.95 because t0.95=enter your response here. ​(Round to two decimal places as​ needed.)

In a random sample of 7 cell phones, the mean full retail price was $548.40 and the standard deviation was $188.00. Further research suggests that the population mean is $432.18. Does the t-value for the original sample fall between - to 95 and t, 95? Assume that the population of full retail prices for cell phones is normally distributed. The t-value of t= (Round to two decimal places as needed.) fall between - to 95 and to 95 because to 95 tents

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The mean lifetime of a certain brand of AAA battery is 120 hours with a standard deviation of 15 hours. If the Z-score of a battery is -0.6, how long did the battery last?

In a school district, all sixth grade students take the same standardized test. The superintendant of the school district takes a random sample of 30 scores from all of the students who took the test. She sees that the mean score is 169 with a standard deviation of 7.0674. The superintendant wants to know if the standard deviation has changed this year. Previously, the population standard deviation was 13. Is there evidence that the standard deviation of test scores has decreased at the α=0.005 level? Assume the population is normally distributed. Step 4: Make a decision. Is it reject Null hypothesis or Fail to reject Null hypothesis? Step 5: What is the conclusion? Is there sufficient evidence or there is not sufficient evidence to show that the standard deviation of the test scores has decreased?

Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the z-score of man who is 72.2 inches tall. (to 4 decimal places)

to qualify for membership in a certain high-IQ society a person must score in the upper 2% of the population on an IQ test. the minimum IQ score to be in the upper 2% is a 140.5 if Iq scores are normanlly distributed with a standrd deviation of 10, what is the mean IQ score?

The sample mean of depression scores of 16 fifth graders was 4.4 with standard deviation of 8. If the population mean of this depression score is 6, what is the calculated t score for this sample?

In a random sample of 8 cell phones, the mean full retail price was $549.30 and the standard deviation was $182.00. Further research suggests that the population mean is $425.14. Does the t-value for the original sample fall between - to 95 and to 95? Assume that the population of full retail prices for cell phones is normally distributed. The t-value of t = fall between - to 95 and to 95 because to 95 (Round to two decima d.) does not does