Statistics and Probability questions and answers in August 2021

Two owners of a cattle ranch, Robert and Val, want to find the average weight for the ranch's 200 cows. Instead of weighing all of the cows: Robert weighs 25 cows and gets an average weight of 1,550 p...
Consider the following game: First, a number N is drawn from the uniform distribution on the set {1, 2, 3, 4}. Then, a fair coin is flipped N times. If you flip at most one heads, you win. a) What is ...
Consider the following game: First, a number N is drawn from the uniform distribution on the set {1, 2, 3, 4}. Then, a fair coin is flipped N times. If you flip at most one heads, you win. a) What is ...
A chess board is an 8 by 8 grid. Suppose 8 pieces are randomly placed on the board, into distinct positions. a) What is the probability that no two pieces are in the same row or column? b) What is the...
If a scatter plot of variables  X  and  Y  shows a trend that can be summarized to a large degree by a straight line with slope 0.8 and y-intercept 0.2 (i.e.,  Y  = 0.2 + 0.8 X ), then the corre...
Record your responses from the corresponding test sheet here. Pay careful attention to the numbering, and be precise in your entries. Instructions Directions:  Solve the following problems and answe...
In the regression equation,  ŷ  = 2.164 + 1.3657x, and n = 6, the mean of x is 8.667, SSxx = 89.333 and Se = 3.44. A 95% prediction interval for y when x = 8 is _________. (3.56, 22.62) (9.13, 17...
A runner tracks her average weekly mileage while marathon training along with her marathon finish times, given by the table below. Classify the correlation between two variables. Weekly Mileage Marath...
More than 46% of workers got their job through networking. Express the null and alternative hypotheses in symbolic form for this claim (enter as a percentage). H0:p= H1:p=   Use the following codes t...
No in depth explanation needed.. Question 20 of 20 - / 2.5 View Policies Current Attempt in Progress The data in the table below represent number of months spent training (x) and finish times in minut...
A competency test is modified so that the proportion of test-takers that pass is more than 75% . A simple random sample of test-takers is collected to determine if the proportion of passers is greater...
1- Assume that random guesses are made for eight multiple choice questions on an SAT​ test, so that there are n=8 ​trials, each with probability of success​ (correct) given by p=0.35. Find the...