Chapter 9: Q. 40 (page 539)
If you do not reject the null hypothesis, then it must be true. Is this statement correct? State why or why not in complete sentences.
The given statement is incorrect.
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According to an article in Bloomberg Businessweek, New York City's most recent adult smoking rate is 14%. Suppose that a survey is conducted to determine this yearโs rate. Nine out of 70 randomly chosen N.Y. City residents reply that they smoke. Conduct a hypothesis test to determine if the rate is still 14% or if it has decreased.
The Weather Underground reported that the mean amount of summer rainfall for the northeastern US is at least inches. Ten cities in the northeast are randomly selected and the mean rainfall amount is calculated to be inches with a standard deviation of inches. At the level, can it be concluded that the mean rainfall was below the reported average? What if ? Assume the amount of summer rainfall follows a normal distribution.
A recent survey in the N.Y. Times Almanac indicated that 48.8% of families own stock. A broker wanted to determine if this survey could be valid. He surveyed a random sample of 250 families and found that 142 owned some type of stock. At the 0.05 significance level, can the survey be considered to be accurate?
A statistics instructor believes that fewer than of Evergreen Valley College (EVC) students attended the opening
night midnight showing of the latest Harry Potter movie. She surveys of her students and finds that attended the
midnight showing. An appropriate alternative hypothesis is:
According to the Center for Disease Control website, in at leastof high school students have smoked a cigarette. An Introduction to Statistics class in Davies County,KY conducted a hypothesis test at the local high school (a medium sizedโapproximately studentsโsmall city demographic) to determine if the local high schoolโs percentage was lower. One hundred fifty students were chosen at random and surveyed. Of the students surveyed, have smoked. Use a significance level of and using appropriate statistical evidence, conduct a hypothesis test and state the conclusions.
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