8.1 Practice Writing Hypotheses & Interpreting P Value DUE 5/3 - WENDY NOSAL | Library | Formative

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At the Hawaii Pineapple Company, managers are interested in the size of the pineapples grown in the company’s fields. Last year, the mean weight of the pineapples harvested from one large field was 31 ounces.
A new irrigation system was installed in this field after the growing season. Managers wonder if the mean weight of pineapples grown in the field this year will be greater than last year. So they take an SRS of 50 pineapples from this year’s crop.
What is the parameter of interest?
What are the null and alternative hypotheses?

Draggable item		Corresponding Item
True mean weight of pineapples grown in the field this year=31 oz.		Parameter of interest
Mean weight of pineapples

The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures students’ attitudes toward school and study habits. Scores range from 0 to 200. The mean score for U.S. college students is about 115.
A teacher suspects that older students have better attitudes toward school. She gives the SSHA to an SRS of 45 of the more than 1000 students at her college who are at least 30 years of age.
What is the parameter of interest?
What are the null and alternative hypotheses?

Draggable item		Corresponding Item
True mean score for U.S. college students' attitude toward school & study habits		Parameter of interest
Mean score for the SRS of 45 students at her college

A Gallup Poll report revealed that 72% of teens said they seldom or never argue with their friends. Yvonne wonders whether this result holds true in her large high school. She surveys a random sample of 150 students at her school.
What is the parameter of interest?
What are the null and alternative hypotheses?

Draggable item		Corresponding Item
True proportion = 72%

		Null Hypothesis