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For the following data, verify that you do not reject with the ANOVA F testing with α = .05, but you do reject with Welch's test.
Group 1:
10
11
12
9
8
7
Group 2:
66
15
32
22
51
Group 3:
1
42
31
55
19
What might explain the discrepancy between the two methods?
For a random sample of 18 investments in China, the average return was 6.1% and the standard deviation was 5.3%. Conduct a test for equality of population means using α = 0.01.
A bookcase contains 3 statistics books and 4 biology books. If 2 books are chosen at random, find the chance that both are statistics books.
Estimate the expected number of sites occupied for a given value of p. If p is small, can you choose the tape long enough so that there is a small probability that a new job will have to be turned away (i.e., that all the sites are occupied)?
Identify the independent and dependent variables. Perform a regression analysis on the data.
The maximum likelihood estimate for D is the number of defectives which gives the highest probability for obtaining the number of defectives observed in the sample. Guess this number D and then write a computer program to verify your guess.
prizes and the chances of winning in a sweepstakes are given in the table below.prizechances250000001 chance in
Can you think of an example where regression analysis can be used? How is regression analysis being used in a retail environment, or how should it be used?
It would like to be plus or minus $10 of the true mean with a 98% confidence level. The standard deviation is thought to be $500. How many card holders should be sampled?
what is the value of the t score for a 98 confidence interval if we take a sample of size 22?a. 2.845b. 2.518c. 2.861d.
ACT scores of high school seniors. The scores of high school seniors on the ACT college entrance examination in 2003 had mean JL = 20.80 and standard deviation (J = 4.80. The distribution of scores is only roughly Normal.
a crossover trial is conducted to compare an experimental medication for migraine headaches to a currently available
At the 0.05 level of significance, is there evidence of a significant relationship between the age groups and where people primarily get their news? If so explain the relationship.
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