Find the minimum sample size n needed to estimate u for the given values of c, o, and E. c=0.90, o = 5.5, and E = 1 Assume that a preliminary sample has at least 30 members. n = (Round up to the nearest whole number.)

1. Consider the dataset below: 3 -574828-3-6 a) What is the sample size? b) Calculate the sample mean. c) Find the sample median. d) What is the shape of the distribution? e) Find Qi, Q and Qs.

B,C?

A sample is selected from a normal population with µ = 54 and σ = 8. Which of the following samples would be considered extreme and unrepresentative for this population? A. M = 53 and n = 81 B. M = 52 and n = 36 C. M = 53 and n = 36 D. M = 52 and n = 81

1)   Review the paired samples t test equation below and answer the questions:             1a. What is d with the bar over it called and how do you find it? 1b. What is the S (with subnotation of d) called? 1c. What is n?

3.  Can SAT scores predict college performance?  Let x be a variable that represents SAT score of a computer science major, and let y be a variable that represents a student’s GPA upon graduation.  A random sample of n =15 computer science majors provided their SAT scores and GPAs: x 1232 1070 1086 1287 1130 1048 1121 1095 1135 1208 1333 1160 1186 1243 1261 y 3.52 2.91 2.4 3.47 3.47 2.37 2.4 2.24 3.02 3.32 3.59 2.54 3.19 3.71 3.58   The scatter diagram for the SAT score and GPA is given below:   (a)  Find the sample correlation coefficient r.  Truncate to two decimal places.  What does the value tell you about the data? (b)  Find the equation of the least squares line .  Truncate to four decimal places.  What does the slope mean? (c)  Find the value of the coefficient of determination .  Truncate to two decimal places.  What does this number mean? (d)  What is the predicted GPA if a computer science major got a…

A population consists of the following N= 6 scores: 0, 4, 6, 1, 3, and 5. Compute u and o for the population. Find the z-score for each score in the population. Transform the original population into a new population of N=6 scores with µ = 50 and o = 10.

8.2-2

NOTE: show your solution

6. Given the following sample of n = 10 scores, for each individual score calculate the following: a) z-score b) a new standardized score with M = 50 and s = 20 X 19 10 2 16 13 4 11 6 18 15 X 19 10 2 6341618 15 z-score Standardized Score