18 18 25 19 23 20 65 18 21 18 20 18 18 20 18 19 28 16 18 18 (a) Calculate the values of the sample mean and the standard deviation. (Round your standard deviation to four decimal places.) sample mean 21.9 yr standard deviation Xyr (b) Compute the upper quartile, the lower quartile, and the interquartile range. upper quartile lower quartile interquartile range mild outliers Xyr Xyr yr Enter a number. (c) Are there any mild or extreme outliers present in this data set? (Enter your answers as comma-separated lists. If there is no answer, enter NONE.) extreme outliers 65 X

The lengths of pregnancies in a small rural village are normally distributed with a mean of 266 days and a standard deviation of 16 days. In what range would you expect to find the middle 95% of most pregnancies? Between_______ and________ . If you were to draw samples of size 52 from this population, in what range would you expect to find the middle 95% of most averages for the lengths of pregnancies in the sample? Between __________and ________. Enter your answers as numbers. Your answers should be accurate to 1 decimal places.

3565 6781 11366 5656 10024 9101 9286 10376 7290 15558 6657 20795 4027 19100 16223 14502 2830 5785 9070 7560 D) Calculate the mean and standard deviation of your data set. You may use technology such as Google Sheets, Excel, or a TI-83/TI-84. Round to the nearest hundredth. Mean 9777.6 Standard Deviation 5090.73 E) Using a significance level a = 0.05, find the critical value using the following steps. 1. What are the degrees of freedom? n D20 d. f.= n- 1=19 = 19 2. Will this be a one-tailed or two tailed test? two-tailed 3. Using table 5 from the back of your textbook (page A18 in Appendix B), what is the critical value? 1.729

GMAT scores are approximately normally distributed with a mean of 547 and a standard deviation of 95. Estimate the percentage of scores that were(a) between 452 and 642. ________%(b) above 832._________ %(c) below 452. ___________%(d) between 357 and 642. ___________%   Answer the blanks.

The ___________ is a weighted average of the Standard Deviations of the conditions of an IV in an independent samples t-test. Pooled estimate of the Standard deviation Standard deviation of the difference Population Standard deviation Standard error of the difference

Question H The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 1261 chips and a standard deviation of 118 chips. (a) Determine the 28th percentile for the number of chocolate chips in a bag. (b) Determine the number of chocolate chips in a bag that make up the middle 96% of bags. (c) What is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies? (a) The 28th percentile for the number of chocolate chips in a bag of chocolate chip cookies is (Round to the nearest whole number as needed.) chocolate chips. (b) The number of chocolate chips in a bag that make up the middle 96% of bags is | (Round to the nearest whole number as needed. Use ascending order.) chocolate chips. to (c) The interquartile range of the number of chocolate chips is (Round to the nearest whole number as needed.) Enter your answer in each of the answer boxes. 11:59pm thase Options A0.50LA Type here to search

Also need... Find standardized test statistic Find P Value Reject or fail to reject & is or is not enough evidence

sho 40 28.5 min Population standard deviation dev 35.2 min 7.2 min nat Source: www.census.gov 9.1 min Sou O Heights of 9-Year-Olds At age 9 the average weight 13. P (21.3 kg) and the average height (124.5 cm) for both boys and girls are exactly the same. A random sample of 9-year-olds yielded these results. At a = 0.05, do the fo data support the given claim that there is a difference in heights? Boys Girls 60 50 Sample size Mean height, cm 123.5 126.2 120 98 Population variance Source: www.healthepic.com nital Stays The average length of “short hat for

Consider the following sample data. Sample A: 11, 22, 33 Sample B: 81, 92, 103 Sample C: 1,100; 1,111; 1,122   (a) Find the mean and standard deviation for each sample.    Sample A: Sample B: Sample C: Mean       Sample Standard Deviation          (b) What does this exercise show about the standard deviation?  multiple choice The idea is to illustrate that the standard deviation is not a function of the value of the mean. The idea is to illustrate that the standard deviation is a function of the value of the mean.

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