1. Using the grouped data below, answer the following correctly and make an analysis. Scores of 50 students in a 75-item Mathematics exam. f of (<) Xm Scores LB fXm 22-29 11 30-37 15 38-45 9 46-53 6 54-61 5 62-69 70-77 1 (Xm-X) (Xm-X) (Xm-X) (Xm-X) b) Standard deviation Σ(Xm-x)² Sm n-1 2 Total 50 (Cont.) Scores 22-29 11 30-37 15 38-45 9 46-53 6 54-61 5 62-69 2 70-77 2 Total 50 b) Meani 2 7-ΣfXm 21 e) Median 2- sk. &=LB+i f) Coefficient of Skewness Skewness (Approximation formula) 3(X-X) 3( LB= () +(--) Xm-X (Xm-X)² f(Xm-x)² + e) Coefficient of (Accurate formula) nΣf(x-x)' (n-1)(n-2)s ( (-1)(-2)( sk=-

Step 2 x x - mean  (x-mean)2 20 20-35=-15 225 30 30-35=-5 25 40  40-35=5 25 50  50-35=15 225 n = 4   mean =35 Sum =500   Given the raw data 20, 30, 40, 50, fill in the table below to calculate the standard deviation using the SD formula (ROUND ALL DECIMAL ANSWERS TO THE NEAREST HUNDREDTH): 1)The square root of the quotient found is  = 2) Divide the Sum of the last column you found by (n-1)= 166.77??  I BELIEVE THIS IS THE ANSWER.   3) The square root of the quotient found is S =    4) Because n<30, the value for the SD is S.  That is, the standard deviation of the raw data is=

4. Summary statistics for the data are shown in the table below. Меan Standard Deviation Iland, x 17.682 1.168 Foot, y 23.318 1.230 Pearson correlation r 0.948 (a) Find the slope by using the formula (b) Find the y-intercept by using the formula a = y – br (c) Find the regresssion equation, using the words "IHand" and "Foot," not r and y. (d) Using the regression equation, predict the foot length (in em) for someone who has a hand length of 18 cm.

Part C. To reduce the percentage of defective chips the company...

6.2-2

Number 103 part D and E

i was wondering if i could get help with questions a and b

#10. A psychologist is studying the self image of smokers, which she measures by the self image (SI) score from a personality inventory. She would like to estimate the mean SI score, U ( mean population), for the population of all smokers. She plans to take a random sample of SI scores for smokers an estimate U (population mean) via the sample. Assuming that the standard deviation of SI scores for the population of all smokers is 82, what is the minimum sample size needed for the psychologist to be 99% confident that her estimate is within 12 of U (population mean)? Carry your intermediate computations to at least three decimal places write your answer as a whole number, and make sure it is the minimum whole number that satisfies the requirements .