random sample of exam scores. The sample has a mean of 488 and a standard deviation of 73. For each of the following sampling scenarios, choose an appropriate test statistic for our hypothesis test on the population mean. Then calculate that statistic. Round your answers to two decimal places. (a) The sample has size 105, and it is from a non-normally distributed population with a known standard deviation of 78. O== 0 0 O It is unclear which test statistic to use. t = (b) The sample has size 13, and it is from a normally distributed population with an unknown standard deviation. O== Ot= O It is unclear which test statistic to use. 圖8民□图〗

Consider the data from the Anthropology 105 class.  The mean for women is 64.33 in and the standard deviation is 2.64 in. The average height of men in the US is approximately 5ft 10in. What proportion of women represented here are shorter than the average man?

Listed below are the numbers of hurricanes that occurred in each year in a certain region. The data are listed in order by year. Find the range, variance, and standard deviation for the given sample data. Include appropriate units in the results. What important feature of the data is not revealed by any of the measures of variation? 8 2 7 2 The range of the sample data is (Round to one decimal place as needed.) The standard deviation of the sample data is (Round to one decimal place as needed.) 3 14 12 6 The variance of the sample data is (Round to one decimal place as needed.) What important feature of the data is not revealed through the different measures of variation? (...) 17 1 15 10 O A. The measures of variation reveal no information about the scale of the data. B. The measures of variation reveal nothing about how the numbers of hurricanes are spread. O C. The measures of variation reveal nothing about the pattern over time. O D. The measures of variation do not reveal the…

Given two independent random samples with the following results: ₁ = 16 n₁ = 8 ₁ = 98 ₁ = 70 s₁ = 15 5 = 19 Use this data to find the 90% confidence interval for the true difference between the population means. Assume that the population variances are equal and that the two populations are normally distributed. Step 3 of 3: Construct the 90% confidence interval. Round your answers to the nearest integer. Copy Data

Which of the following is not needed to compute a t statistic? Question 18 options: A hypothesized value for the population mean The value of the population variance or standard deviation The value of the sample mean The value of the sample variance or standard deviation

Consider the following data: −10, −10, 0, 3, −10, 3, 3  Step 1 of 3: Calculate the value of the sample Variance. Round your answer to one decimal place. Step 2 of 3: Calculate the value of the sample deviation. Round your answer to one decimal place. Step 3 of 3: Calculate the value of the range.

If someone could help me answer this that would be great.

Question 13 The time to complete an exam is approximately Normal with a mean of 43 minutes and a standard deviation of 5 minutes. The bell curve below represents the distribution for testing times. The scale on the horizontal axis is equal to the standard deviation. Fill in the indicated boxes. H = 43 o = 5 H-30 u-20 u+ 20 u+ 30 00 Question Help: e Written Example Message instructor Submit Question Jump to Answer

Find the population variance and standard deviation for the following population. Round the answers to at least one decimal place. 17 7 18 7 24 21   The population variance is  42.6 .The population standard deviation is  6.5 .       Can you verify if these answer are correct? If I did this correct?

Engineers must consider the breadths of male heads when designing helmets. The company researchers have determined that the population of potential clientele have head breadths that are normally distributed with a mean of 6.4-in and a standard deviation of 0.9-in.In what range would you expect to find the middle 95% of most head breadths? Between ______ and ______   If you were to draw samples of size 47 from this population, in what range would you expect to find the middle 95% of most averages for the breadths of male heads in the sample?   Between ______ and _______