42 68 (F) Round to the mean as needed Class Frequency, f Midpoint Relative frequency Cumulative frequency 17:27 18 22 0.05 18 28-38 42 ☐
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- Miswrote P(x) 0.041 for 0.141, which changes the mean to 1.5.Find the area of the shaded region. The graph to the right depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. The area of the shaded region is (Round to four decimal places as needed.)The mean age of a class of twenty-five students is 23.8 years. How old would a twenty-sixth student have to be for the mean age of the class to be 24.0 years? yr
- The median is measure of variation true or falseKara has five exam scores of 6363, 5959, 6767, 7575, and 7373 in her biology class. What score does she need on the final exam to have a mean grade of 7070?A cardiologist wants to determine whether there is a change in blood pressure when her patients are given a new medication. She samples 45 patients and measures their systolic blood pressure. After ten weeks on the medication, the same 45 patients have their blood pressure measured again. The cardiologist is interested in estimating the mean difference in systolic blood pressure levels after taking the new medication. The mean difference (after medication - before medication) for the 45 sampled patients is -2 mmHg and the sample standard deviation is 0.4 mmHg. In one complete sentence, explain why the researcher will need to use paired t-methods when constructing the confidence interval for the mean difference in blood pressure. When constructing a 95% confidence interval for the mean difference in systolic blood pressure after taking the medication, what value should be used for the point estimate? Calculate the margin of error for the 95% confidence interval for the mean difference…
- Find the weighted mean for a particular student's scores on three exams if the first one was worth 75 points and the student received a score of , the second was worth 50 points and the student received a score of , and the third was worth 30 points and the student received a score of ?Using excel the median is 16.70 but when I calculate it manually it comes to 13.9. Why is excel wrong? A magazine's list of the world's most admired companies for 2014 is provided in the data below. The data in the column labeled "Return" shows the one-year total return (%) for the top ranked 50 companies. For the same time period the S&P average return was 18.4%. Rank CompanyName Return(%) 1 Company A 13.8 2 Company B 28.8 3 Company C 48.3 4 Company D 10.7 5 Company E 27.1 6 Company F 2.4 7 Company G 33.8 8 Company H 23.4 9 Company I 83.5 10 Company J 12.3 11 Company K 40.6 12 Company L 7.1 13 Company M 31.8 14 Company N 15.1 15 Company O 4.1 16 Company P −12.4 17 Company Q 4.8 18 Company R −14.9 19 Company S 19.5 20 Company T 14 21 Company U −11.9 22 Company V 1.8 23 Company W 27.3 24 Company X 35.2 25 Company Y 30.3 Rank CompanyName Return(%) 26 Company Z 63.2 27 Company AA 2.5 28 Company BB 6.5 29…Absolute error- 38.80 microliters - 40.00 mocroliters/ 40.00 microliters *100=
