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lesya692 [45]
3 years ago
6

12. If Zoey has a bag of marbles containing 18 red marbles, how many blue marbles should she add to the bag so that the probabil

ity of her drawing a blue marble from the bag is \frac{1}{4}
1
4
?
Mathematics
1 answer:
jekas [21]3 years ago
6 0
She should add six blue marbles

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a) The mean age of graduate students at a University is at most 31 y ears with a standard deviation of two years. A random sampl
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Answer:

A.)

H0: μ ≤ 31

H1: μ > 31

B.)

H0: μ ≥ 16

H1: μ < 16

C.)

Right tailed test

D.)

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Step-by-step explanation:

The significance level , α = 0.01

The Pvalue = 0.0264

The decision region :

Reject the null if :

Pvalue < α

0.0264 > 0.01

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B.)

H0: μ ≥ 16

H1: μ < 16

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One sample t - test

C.)

Null hypothesis :

H0 : μ ≤ 12

. The direction of the sign in the alternative hypothesis signifies the type of test or tht opposite direction of the sign in the null hypothesis.

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d.)

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