A word is randomly selected from a newspaper article. A random variableXis defined as the number of letters in that word. What are the possible values ofX?

X={2, 3, ...}

X={0, 1, 2, ...}

X={1, 2, 3, ...}

X={1, 2, 3, 4, 5}

A quiz consists of 18 questions. Each question has 2 answer choices with exactly one correct answer. A student is completely unprepared for the quiz, so he guesses on all 18 questions. How many questions should the student expect to answer correctly?

6

8

9

12

18

If the standard deviation of a population is known and we wish to estimate the population mean with 99% confidence, what is the appropriate critical value 'z' to use?

2.58

2.33

1.96

1.645

1.28

Suppose that= 135 and= 20. Find the score 2.8 standard deviations below the mean.

79

71

17

57

A proportion of a college basketball team's season ticket holders renew their tickets for the next season. Let 'p' denote the true proportion of ticket holders who buy tickets again for the following season. A random sample of 134 ticket holders revealed 93 people plan on renewing their tickets. Find the point estimate for 'p'.

0.8240298507

0.3059701493

0.6940298507

1.440860215

0.4408602151