Lyndyc

This page lists questions and answers that were posted by visitors named Lyndyc.

Questions

The following questions were asked by visitors named Lyndyc.

True or False All probabilities can be expressed as decimal values ranging from 0 to 1.00.

True or False The value for a probability can never be less than zero, unless you have made a computational error.

True or False One requirement of a random sample is that every individual in the population has an equal chance of being selected.

True or False A jar contains 15 red marbles and 75 blue marbles. If you randomly select a marble from this jar, the probability of obtaining a red marble is p = 15/90.

True or False For any normal distribution, the proportion in the tail beyond z = 2.00 is p = 0.0228.

A normal distribution has a mean of ƒÝ = 100 with ƒã = 20. If one score is randomly selected from this distribution, what is the probability that the score will have a value between X = 90 and X = 110? a. 0.6915 b. 0.3085 c. 0.1915 d. 0.3830

Find the Standard Deviation for this distribution of scores. Then find the z score for X=86. N=17 98, 92, 86, 84 , 76, 74 , 72 , 72, 72 , 70, 70, 66, 60 ,54, 32,30

How would you find the z-score for the following X=86 and the n=17.

A sample of n = 9 scores is obtained from a population with ƒÝ = 70 and ƒã = 18. If the sample mean is M = 76, then what is the z-score for the sample mean? a. z = 0.33 b. z = 0.50 c. z = 1.00 d. z = 3.00

True or False If a sample of at least 30 scores is randomly selected from a normal population, the sample mean will be equal to the population mean.

True or False In order for the distribution of sample means to be normal, it must be based on samples of at least n = 30 scores.

True or False According to the central limit theorem, the expected value for a sample mean becomes smaller, approaching zero, as the sample size approaches infinity.

True or False As sample size increases, the value of the standard error also increases.

True or False The mean for a sample of n = 4 scores has a standard error of 5 points. This sample was selected from a population with a standard deviation of ƒã = 20.

For a population with a mean of µ=60 and standard deviation of Ợ=24, find the z=score corresponding to each of the following samples a. M=63 for sample of n=16 scores b. M=63 for sample of n=36 scores c. M=63 for sample of n=64 scores

Which of the following will increase the power of a statistical test? a. Change ƒÑ from .05 to .01. b. Change from a one-tailed test to a two-tailed test. c. Change the sample size from n = 100 to n = 25. d. None of the other options will increase power.

When is there a risk of a Type II error? a. whenever H0 is rejected b. whenever H1 is rejected c. whenever the decision is "fail to reject H0" d. The risk of a Type II error is independent of the decision from a hypothesis test.

What is the consequence of a Type II error? a. concluding that a treatment has an effect when it really does b. concluding that a treatment has no effect when it really has no effect c. concluding that a treatment has no effect when it really does d. conc...

Which of the following is an accurate definition of a Type II error? a. rejecting a false null hypothesis b. rejecting a true null hypothesis c. failing to reject a false null hypothesis d. failing to reject a true null hypothesis

The sum of the squared deviation scores is SS = 20 for a population of N = 5 scores. What is the variance for this population? a. 4 b. 5 c. 80 d. 100

Last week Tom had exams in Math and in Spanish. He had a score of 45 on the Math exam and a score of 65 on the Spanish exam. For which class should Tom expect the better grade? a. Math b. Spanish c. The grades should be the same because the two exam score...

A random sample of n = 4 scores is selected from a population with ƒÝ = 80 and ƒã = 20. On average, how much difference would you expect between the sample mean and the population mean? a. 0 points (the sample mean should be the same as the population mea...

True or False The class interval of 25-29 has real limits of 24.5 and 29.5.

true or false The value for the standard deviation cannot be larger than the value for the range.

True or False A sample mean with a z-score value between 1.00 and +1.00 would be considered a fairly typical, representative sample.

True or False For a sample with M = 20 and s = 1, a score of X = 17 would be considered an extremely low score.

True or False For any normal distribution, the proportion corresponding to scores greater than z = +1.00 is exactly equal to the proportion corresponding to scores less than z = 1.00.

True or False If one score is randomly selected from a normal distribution with  = 100 and  = 20, the probability of obtaining a score between X = 80 and X = 120 is 0.3413.

True Or False Using the average score to describe a sample is an example of inferential statistics. By reading the definition in my book I feel as though this phrase is false. Can someone please advise on this matter?

A sample from a population with  = 40 and  = 10 has a mean of M = 44. If the sample mean corresponds to a z = 2.00, then how many scores are in the sample? a. n = 100 b. n = 25 c. n = 5 d. n = 4

For a particular population, a sample of n = 4 scores has an expected value of 10. For the same population, a sample of n = 25 scores would have an expected value of ____. a. 4 b. 8 c. 10 d. 20

What are two strategies to follow when critically evaluating a study?

Why is the Rorschach so controversial?

Answers

The following answers were posted by visitors named Lyndyc.

Reiny Thank you for your help on this homework.

Thank you for the help.

Thank you for all your help.

is this statement true or false.

how would I find the n for this equation?

Thanks for the help I finally found out where I would receive my n from.

Thank you for you help, once again you're awesome.

Would A be the right answer?

Thank you so much for your help

So would the answer be false

I'm sorry that this question was posted twice I was having problems with my internet due to the snow storms. I would still like to have help answering this question.

For this answer I got n=4 would this be right considering the numbers in the equation.