Statistics Midterm Review 2017-2018 My 5th 3) My 1t period stats class had a mea
ID: 3350291 • Letter: S
Question
Statistics Midterm Review 2017-2018 My 5th 3) My 1t period stats class had a mean test average of 80 with standard deviation of B period geometry class had a mean test average of 68 with standard deviation of 6. ayley and Steve are brother and sister. Hayley is in stats and made an 87 on her stats test steve is in geometry and made a 76 on his geometry test. The parents are mad at Steve for having a lower grade than his sister. Using eech sibling's7-score. find out whio sflicl better on 4) Using Table-A, find the percentages that are: ) below a z-score of 1.43 i) above a z-score of -0.59 ii) between a z-score of -1.88 and 0.36 5) The following lists heights in inches of a class of students 63 67 74 59 78 68 66 63 67 i) Julianne's height is 67 inches. Find her percentile. i) Explain in words what Julianne's percentile means. 6) If Julianne's average drying cycle while doing laundry is 65 minutes with standard deviation of 8 minutes, what percentage of the time is her drying cycle less than an hour? Marking Period 2 Material: Chapter 4 1) If the linear regression model of y = 73.47-422x shows how your test grade can be affected by the number of minutes that you sleep in class. Given this model, what is the predicted grade for someone who sleeps half an hour? 2) What are the values that the correlation coefficient r can take? 3) Consider a scenario where the more bills you have, the less money you have in the bank. If these two variables have a high degree of association, which value given could represent their relationship of correlation? -1,-0.89,-0.34, 0,0.29, 0.91, 1Explanation / Answer
Since you have multiple questions posted,i would attach answer for first one.Can you please post questions one at a time ?
4) Use table -A as mentioned or use z table
i) P( z<1.43) =0.9236 [Using z table]
ii) P( z > -0.59) = 1- P(z < -0.59)
= 1- 0.2776 [ using z table]
=0.7224
iii) P ( -1.88 < z < 0.36) =P(z<0.36) -P(z<-1.88)
=0.6406 - 0.0301
=0.6105