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What is the relative frequency of letter i

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1. During the last 10 years marketing executives believed that the same proportion of adult men and adult women watched TV news programs. The marketing executives would like to perform a statistical test to assure themselves that a greater proportion of women now watch TV news programs than men. What should be used for the Null and alternative hypothesis to perform this test?

2. AMR is a computer consulting firm. The number of new clients that they have obtained each month has ranged from 0 to 6. The number of new clients has the probability distribution that is shown below.

Number of new clients

Probability

0

0.05

1

0.10

2

0.15

3

0.35

4

0.20

5

0.10

6

0.05

Refer to exhibit above, what is the variance?

3. Consider the letters involved in the word STATISTICS.

a). How many "bars" would be involved if you were supposed to construct a bar graph to represent the frequency distribution of letters?

b). What is the relative frequency of letter I?

4. For a standard normal distribution, the probability of obtaining a z value between -2.4 to -2.0 is?

5. Given that Z is a standard normal random variable, what is the value of Z if the area to the left of Z is 0.9382?

Reference no: EM13946505

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