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Four brands of light bulbs are being considered for use in the final assembly area of the Saturn plant in Spring Hill, Tennessee. The director of purchasing asked for samples of 100 from each manufacturer. The numbers of acceptable and unacceptable bulbs from each manufacturer are shown below. At the .05 significance level, is there a difference in the quality of the bulbs?Manufacturer
A B C D
Unacceptable 12 8 5 11
Acceptable 88 92 95 89
Total 100 100 100 100
Probability that the entire batch will be rejected?
What is probability of selecting 2 families neither had taxes prepared by H&R Block?
Last school year, student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classificati..
At the .01 level of significance, is the mean grade of the female students higher than that of the males?
At 0.05 level of significance, is there enough evidence to conclude that difference exists between proportion of students who have ear infections at one school and the other?
At least half the patients are under 15 years old? First, explain how this can be modeled as a binomial distribution with 8 trials, where success is visitor age is under 15 years old and the probability of success is 20%.
Is the z value positive or negative? Explain why it should be positive or negative.
Find the regression equation and percentage of variance and test whether the equation is significant portion of the variance.
If one invested in Stock A, Determine standard deviation of percentage return?
Let p represent the proportion of registered voters in the state that would vote for the Republican candidate. The standard error for the proportion of those who phoned in who answered "yes" is
Use differential calculus to find both sales volume at which revenue is maximised and the maximum revenue available from sales of product X.
The researcher found that Lincoln's educational score did not correlate with the expected variables.
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