The mean would increase by 50 points.

Question

asked 2020-10-27

A population of N =16 scores has a mean of p = 20,
After one score is removed from the population, the new mean is found to be \(\displaystyleμ={19}\). What is the value of ine score that was removed? (Hint: Compare the val-
ues for X before and after the score was removed.)

asked 2021-01-31

In one study, the correlation between the educational level of husbands and wives in a certain town was about 0.50, both averaged 12 years of schooling completed, with an SD of 3 years.

a) Predict the educational level of a woman whose husband has completed 18 years of schooling b) Predict the educational level of a man whose wife has completed 15 years of schooling. c) Apparently, well-educated men marry women who are less well educated than themselves. But the women marry men with even less education. How is this possible?

a) Predict the educational level of a woman whose husband has completed 18 years of schooling b) Predict the educational level of a man whose wife has completed 15 years of schooling. c) Apparently, well-educated men marry women who are less well educated than themselves. But the women marry men with even less education. How is this possible?

asked 2021-01-10

The problem reads: Suppose \(\displaystyle{P}{\left({X}_{{1}}\right)}={.75}\) and \(\displaystyle{P}{\left({Y}_{{2}}{\mid}{X}_{{1}}\right)}={.40}\). What is the joint probability of \(\displaystyle{X}_{{1}}\) and \(\displaystyle{Y}_{{2}}\)?

This is how I answered it. P(\(\displaystyle{X}_{{1}}\) and \(\displaystyle{Y}_{{2}}\)) \(\displaystyle={P}{\left({X}_{{1}}\right)}\times{P}{\left({Y}_{{1}}{\mid}{X}_{{1}}\right)}={.75}\times{.40}={0.3}.\)

What I don't understand is how do you get the \(\displaystyle{P}{\left({Y}_{{1}}{\mid}{X}_{{1}}\right)}\)? I am totally new to Statistices and I need to understand each part of the process in order to get the whole concept. Can anyone help me to understand why the P and X exist and what they represent?

This is how I answered it. P(\(\displaystyle{X}_{{1}}\) and \(\displaystyle{Y}_{{2}}\)) \(\displaystyle={P}{\left({X}_{{1}}\right)}\times{P}{\left({Y}_{{1}}{\mid}{X}_{{1}}\right)}={.75}\times{.40}={0.3}.\)

What I don't understand is how do you get the \(\displaystyle{P}{\left({Y}_{{1}}{\mid}{X}_{{1}}\right)}\)? I am totally new to Statistices and I need to understand each part of the process in order to get the whole concept. Can anyone help me to understand why the P and X exist and what they represent?

asked 2020-12-24

Suppose a class consists of 4 students majoring in Mathematics, 3 students majoring in Chemistry and 4 students majoring in Computer Science. How many compositions are possible to form a group of 3 students if each group should consist at most 2 students majoring in Computer Science?

asked 2021-01-04

Suppose a class consists of 5 students majoring in Computer Science, 5 students majoring in Chemistry and 3 students majoring in Mathematics. How many ways are possible to form a group of 3 students if each group should consist at most 2 students majoring in Computer Science?

asked 2020-12-17

Dree rolls a strike in 6 out of the 10 frames of bowling. What is the experimental probability that Dree will roll a strike in the first frame of the next game? Explain why a number cube would not be a good way to simulate this situation.

asked 2021-02-21

If Jeremy has 4 times as many dimes as nickels and they have a combined value of 360 cents, how many of each coin does he have?

asked 2020-12-13

A radio station gives a pair of concert tickets to the six caller who knows the birthday of the performer. For each person who calls, the probability is 0.75 of knowing the performer's birthday. All calls are independent.

a) What is the PMF of L, the numberof calls necessary to find the winner? MSK b) What is the probability of finding the winner on the tenth caller?

c) What is the probability of finding the winner on the tenth caller?

a) What is the PMF of L, the numberof calls necessary to find the winner? MSK b) What is the probability of finding the winner on the tenth caller?

c) What is the probability of finding the winner on the tenth caller?

asked 2021-02-05

A radio station gives a pair of concert tickets to the 6th called who knows the birthday of the performer. For each person who calls, the probability is.75 of knowing the performer birthday. All calls are independent.

a. What is the PMF (Probability Mass Function) of L, the number of calls necessary to find the winner?

b. What is the probability of finding the winner on the 10th call?

c. What is the probability that the station will need 9 or more calls to find a winner?

a. What is the PMF (Probability Mass Function) of L, the number of calls necessary to find the winner?

b. What is the probability of finding the winner on the 10th call?

c. What is the probability that the station will need 9 or more calls to find a winner?

asked 2021-01-19

Suppose the alphabet consists of just {a,b,c,d,e}. Consider strings of letters that show repetitions.
How many 4-letter strings are there that do not contain “aa"?