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# Joint Probability: Let P(A) = .3, P(B) = .4 and P( A U B ) = .7 a. What is the joint probability of A and B? b. Find the probability of the complement of A.

How would I go about answering these questions? Also, how do you differentiate between solving them as a dependent or an independent event?   Let P(A) = .3, P(B) = .4 and P( A ∪ B...

# If the researcher obtains a sample mean of M = 88, which combination of factors is most likely to result in rejecting the null hypothesis?

A researcher administers a treatment to a sample of participants selected from a population with µ = 80. If the researcher obtains a sample mean of M = 88, which combination of factors is most likely...

# If the null hypothesis is true and you run a z-score test using the .05 level of significance, what is the probability that you will make a Type I error?

1. 0.05 2. 0.95 3. 0 4. between 0 and 0.05 5. not enough information to answer.   I'm guessing it is 0.95

TRUE OR FALSE ?

# If a hypothesis test is used to evaluate the effect of the treatment, which combination of factors is most likely to result in rejecting the null hypothesis?

A researcher administers a treatment to a sample of participants selected from a population with µ = 80. If a hypothesis test is used to evaluate the effect of the treatment, which combination of...

# A normal distribution has a mean = 28 with standard deviation = 5. What is the minimum score needed to be in the top 41% of the distribution?

wrong answer: 18

# what is the probability that the sample mean will be greater than m=22

a random sample of n=4 scores is obtained from a normal population with u=20 and o=4. what is the probability that the sample mean will be greater than m=22   wrong answer: 0.3707 is...

# u=76 SD=12, tom scored 8 points below the mean. mary had a score of x=73, and bill had a z score of z=-0.50.

u=76 SD( standard deviation)=12, tom scored 8 points below the mean. mary had a score of x=73, and bill had a z score of z=-0.50. place these three students in order from lowest to highest score   lowest middle  highest    wrong...

# if this student's IQ is reported as a z score , what would the z-score be?

a very bright student is described as having an IQ that is three standard deviations above the mean. if this student's IQ is reported as a z score , what would the z-score be?     1...

# please help

Match the linear correlation coefficient to the scatter diagram. The scales on the x- and y- axes are the same for each diagram. ( a) r = - 0.969 ( b) r = - 0.049 ( c) r = - 1 ( d) r = - 0.992 Response...

# A sample has SS = 20 and s2 = 4. There are _____ scores in the sample.

wrong answer : 5    how do i solve this?

# A sample of n = 4 scores has SS = 12. What is the standard deviation for the sample?

choices :  3 square root of 3 4 square root of 4   wrong answer: square root of 3

# how do i solve this problem?

a certain type of oak tree has a mean growth of 14.3 inches in 4 years. a forest biologist believes a new variety has a greater mean growth during the same length of time. a 36 tree sample of the...

# Need help with statistic Question (Please show all steps)

Given the sample mean, population standard deviation, and confidence level, use the one-mean z-interval procedure to find a confidence interval for the mean of the population.   X‾ =25...

# Need help with statistic Question (Please show all steps)

Find the confidence level and α for: a. An 85% confidence interval. b. A 95% confidence interval.

# Need help with statistic Question (Please Show all steps)

The winner of the 2008-2009 NBA championship was the LA Lakers. One starting lineup for that team is shown in the following table:   Player             ...

# Need help with statistic Question (Please show all steps)

The A.C. Nielsen Company reported that the mean weekly television viewing time for children aged 2-11 is 24.50 hours. Assume that the weekly television viewing times of such children are normally...

Determine Z0.015

# Need help with statistic Question (Please show all steps)

Find the area under the standard normal curve that lies: a. Either to the left of -1 or to the right of 2. b. Either to the left of -2.51 or to the right of -1.