Question

1) use the following info: n=133 X=86 -0.05 To find how large of a sample is needed in order to have a margin of error of 51. rand to the nearest Whole number? 2 In order to get into ABC universito you need to score up to 2.51. of its placement test. The test results are normally distributed with a mean of 42a pts and a standard deviation of 130 pts. What is the minimum scored. needed in order to get into ABC University, Round your answer to the nearest whole number 3) Use the following info to find the Standard deviation of a random variable x | (| xP8) x^ P(x) | I - 2 0 .4 -0.8 1.6 0.0 0.0 0.3 0,3 0.3 0. 2 1 0.4 0.8 round answer to Two decimal places

Answer 1

#1 F = = 86 – 016466 Margin of error t = 0.05 157.) at a= 0.05 level of significance 2412 1.960 . The sample size neaded (n= 17 abo n 0466 x 0.3534 = 352 35.13 0.05 #2 = 429 =30 487.3 The minimum of top 215%. Score of utzo=429+(1.960x 30)= [488] #3 €(x)= x Playz -0.8 +0+ 0.3+0.43 -0.1 Exx²= 2² pla)= litt o+0.3+0.8 - 2.7 The Standard deviation - E12²) - (Em) = √2.7-(-0w.)? - 164) (1.64012)