A sample obtained from a population with σ = 48 has a standard error of σM = 6. How many scores are in the sample?     a. n = 64   b. n = 12   c. n = 36   d. n = 8

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A researcher develops a test for identifying intellectually gifted children. It has a μ=56 and σ=8.  a. what percentage of children are expected to score above 60?  b. What percentage of the scores will be below 54?    *ANSWER BOTH PARTS A & B*

The type of household for the U.S. population and for a random sample of 411 households from a community in Montana are shown below. Type of Household Percent of U.S.Households Observed Numberof Households inthe Community Married with children 26% 92 Married, no children 29% 121 Single parent 9% 31 One person 25% 102 Other (e.g., roommates, siblings) 11% 65 A) Find the value of the chi-square statistic for the sample. (Round the expected frequencies to two decimal places. Round the test statistic to three decimal places.)   B)Find or estimate the P-value of the sample test statistic. (Round your answer to three decimal places.)

Find the standardized test statistic t for a sample with n= 15, x= 10.2, s 0.8, and a= 0.05 if H: H 2 9.9. Round your answer to three decimal places. A. 1.728 B. 1.452 C. 1.631 D. 1.312 Click to select your answer. P Type here to search a +66 hp 2) 立

70 74 79 82 77 80 84 For this sample of golf scores give: 1. Σε. 2. Σ 3. x 4. s= 5. The sample standard deviation =

We will obtain a sample of quarters and weigh them to determine the mean. How many quarters must we randomly select and weigh if we want to be 99% confident that the sample mean is within 0.025 grams of the true population mean for all quarters? Assume that σ = 0.2 grams

Solve the problem. Find the standardized test statistic t for a sample with n = 15, x = 8.7, s = 0.8, and a = 0.05 if Ho: Hs 8.4. Round your answer to three decimal places. a. 1.452 b. 1.631 c. 1.728 d. 1.312