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Exam 5 – Lesson 11
Name____________________
1. Suppose the random variable X follows a chi-square distribution with degrees of freedom equal to 35. Fill in the blanks.
A. m = ______
B. s = ______
2. Check all that apply.
_____ The chi-square graph always has the same shape.
_____ If X follows a chi-square distribution with df = 200, then X approximately follows a normal distribution.
_____ The chi-square distribution is skewed to the right if the degrees of freedom are less than 90.
_____ The test statistic for the chi-square distribution may be zero.
_____ A goodness-of-fit hypothesis test is always right-tailed.
_____ A test of independence tests whether two factors are independent or not..
3. Write the null and alternate hypotheses for the following:
It is believed that public high school students attend school in equal numbers for each day of the school week. Suppose a sample of the days students were present at school was taken for one particular high school:
1750 students were present on Monday.
1800 students were present on Tuesday
1840 students were present on Wednesday
1810 students were present on Thursday
1800 students were present on Friday
Ho:____________________________________________________________________
Ha: ____________________________________________________________________
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