A manufacturing firm claims that the batteries used in their electronic games will last an average of 28 hours. To maintain this average, 16 batteries are tested each month. If the computed t-value falls between - to.01 and to.01, the firm is satisfied with its claim. What conclusion should the firm draw from a sample that has a mea of x = 25.5 hours and a standard deviation of s = 5 hours? Assume the distribution of battery lives to be approximately normal. Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. ..... Since the computed t-value t = does not fall between - to.01 = and to.01 = , the firm should be satisfied with the claim. (Round to three decimal places as needed.)

For a sample with a standard deviation of s=4, a score of X=35 corresponds to Z= -1.25. what is the sample mean?

In a sample of 14 randomly selected high school seniors, the mean score on a standardized test was 1197 and the standard deviation was 166.9. Further research suggests that the population mean score on this test for high school seniors is 1018. Does the t-value for the original sample fall between -to.95 and to.95? Assume that the population of test scores for high school seniors is normally distributed. fall between -to.95 and to.95 because to.95 = The t-value of t= (Round to two decimal places as needed.) C

In a random sample of 6 cell phones, the mean full retail price was $547.30 and the standard deviation was $176.00. Further research suggests that the population mean is $428.25. Does the t-value for the original sample fall between and to.95? Assume that the population of full retail prices for cell phones is normally distributed. - to.95 The t-value of t = fall between -1 -to.95 and to. .95 because to 95 = (Round to two decimal places as needed.)

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2500 grams and a standard deviation of 800 grams while babies born after a gestation period of 40 weeks have a mean weight of 3000 grams and a standard deviation of 385 grams. If a 32​-week gestation period baby weighs 2650 grams and a 41​-week gestation period baby weighs 3150 ​grams, find the corresponding​ z-scores. Which baby weighs more relative to the gestation​ period? Find the corresponding​ z-scores. Which baby weighs relatively more​? Select the correct choice below and fill in the answer boxes to complete your choice. ​(Round to two decimal places as​ needed.)   A. The baby born in week 41 weighs relatively more since its​ z-score, nothing​, is smaller than the​ z-score of nothing for the baby born in week 32.   B. The baby born in week 32 weighs relatively more since its​ z-score, nothing​, is smaller than the​ z-score of nothing for the baby born in week 41.   C. The…

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2900 grams and a standard deviation of 600 grams while babies born after a gestation period of 40 weeks have a mean weight of 3100 grams and a standard deviation of 505 grams. If a 32-week gestation period baby weighs 2575 grams and a 41-week gestation period baby weighs 2775 grams, find the corresponding z-scores. Which baby weighs less relative to the gestation period? Find the corresponding z-scores. Which baby weighs relatively less? Select the correct choice below and fill in the answer boxes to complete your choice. (Round to two decimal places as needed.) O A. The baby born in week 32 weighs relatively less since its z-score, smaller than the z-score of for the baby born in week 41. OB. The baby born in week 32 weighs relatively less since its z-score, larger than the z-score of for the baby born in week 41. OC. The baby born in week 41 weighs relatively less since its z-score, larger than the…

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2500 grams and a standard deviation of 700 grams while babies born after a gestation period of 40 weeks have a mean weight of 2700 grams and a standard deviation of 340 grams. If a 34​-week gestation period baby weighs 2275 grams and a 40​-week gestation period baby weighs 2475 ​grams, find the corresponding​ z-scores. Which baby weighs less relative to the gestation​ period?

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 3000 grams and a standard deviation of 1000 grams while babies born after a gestation period of 40 weeks have a mean weight of 3500 grams and a standard deviation of 545 grams. If a 35-week gestation period baby weighs 3300 grams and a 41-week gestation period baby weighs 3800 grams, find the corresponding z-scores. Which baby weighs more relative to the gestation period? ..... Find the corresponding z-scores. Which baby weighs relatively more? Select the correct choice below and fill in the answer boxes to complete your choice. (Round to two decimal places as needed.) A. The baby born in week 41 weighs relatively more since its z-score, is larger than the z-score of for the baby born in week 35. O B. The baby born in week 35 weighs relatively more since its z-score, is larger than the z-score of for the baby born in week 41. C. The baby born in week 41 weighs relatively more since its z-score, is…

A person's blood glucose level and diabetes are closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. Suppose that after a 12-hour fast, the random variable x will have a distribution that is approximately normal with mean ? = 81 and standard deviation ? = 26. Note: After 50 years of age, both the mean and standard deviation tend to increase. For an adult (under 50) after a 12-hour fast, find the following probabilities. (Round your answers to four decimal places.)   (a) x is more than 60(b) x is less than 110(c) x is between 60 and 110(d) x is greater than 125 (borderline diabetes starts at 125)

A study conducted by Hershey's discovered that Americans consumed an average of 11.4 pounds of chocolate per year. Let's assume that the annual chocolate consumption follows the Normal distribution with mean 11.4 pounds and a standard deviation of 3.6 pounds. Answer the following questions, performing all computations with Excel functions.