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Genetics of peas
According to genetic theory, the blossom color in the second generation of a certain cross of sweet peas should be red or white in a 3:1 ratio. That is, each plant has probability 3/4 of having red blossoms, and the blossom colors of separate plants are independent.
(a) What is the probability that exactly 9 out of 12 of these plants have red blossoms?
(b) What is the mean number of red-blossomed plants when 120 plants of this type are grown from seeds?
the null hypothesis of an f-test comparing three group means is that all three group means are equal. what is the
Find the probability that, out of the 6 people chosen, exactly 5 people use a tax preparer. Find the probability that, out of the 6 people chosen, 4 or 5 people use a tax preparer.
listed below is the amount of commissions earned last month for a sample of eight members of the sales staff at best
If you estimate a regression using OLS, but you do not include an intercept, do you know if the mean of the residuals is zero? Explain.
Psychologists once measured 77 variables on a sample of schizophrenic people and a sample of people who were not schizophrenic. They compared the two samples using 77 separate significance tests.
State a type I error and describe why it happens. Describe the factor that researcher can control to change type I error. Also, describe how type I errors can be avoided.
A new machine, designed to perform the same job, has produced 500 units with the following results.Can the difference in output be ascribed solely to chance?
The sample size n , the sample means, and the sample standard deviations for the two groups are given below.
a researcher claims that the variation in the number of days that factory workers misses due to illness is greater than
The distribution of income of families in the US in 1979 (in actual dollars uncorrected for in?ation) is shown in the table below (Prob 4.28):
question global tv news in a segment on the price of gasoline reported that the mean price nationwide is 1.29 per
We want to be 95% confident in our findings and have a df of 5, what would our critical boundaries be if we were conducting a t test?
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