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wrote...
Posts: 233
2 weeks ago
For the scenario described below, simply name the procedure that is appropriate to answer the question. For example, 1-proportion z-interval or chi-square goodness of fit test. Do NOT carry out the procedure.

A flower pot manufacturer is testing his clay pots to ensure that the thickness of the sides are made to proper specifications. The sides are designed to be 4 mm thick. In a random sample of 25 pots, it is found that the average thickness if 4.3 mm. Does this provide statistically significant evidence that the manufacturing process is out of alignment?
Textbook 

Stats: Modeling the World


Edition: 4th
Authors:
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wrote...
Posts: 248
2 weeks ago
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1-mean t-test
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wrote...
2 weeks ago
For the scenario described below, simply name the procedure that is appropriate to answer the question. For example, 1-proportion z-interval or chi-square goodness of fit test. Do NOT carry out the procedure.

A pollster collects data on gender differences in car preferences. 50 males and 50 females, selected at random, are asked if they prefer American, Asian, or European models when they purchase a car. The pollster wishes to examine if there is an association between gender and car choice when making a purchase.
wrote...
2 weeks ago
chi-square test for homogeneity
wrote...
2 weeks ago
This calls for a celebration Person Raising Both Hands in Celebration
wrote...
2 weeks ago
For the scenario described below, simply name the procedure that is appropriate to answer the question. For example, 1-proportion z-interval or chi-square goodness of fit test. Do NOT carry out the procedure.

In a study on insomnia in men over the age of 65, it is found that exercise may play a role in sleep. The researchers assign a group of 100 men to exercise for a month, while another 100 volunteers are asked to abstain from most exercise. At the end of the month, the exercise group had 23 out of 100 men with difficulty in sleeping, whereas the non-exercise group had 31 out of 100. Does this provide statistically significant that exercise improves sleep for men over 65?
wrote...
2 weeks ago
2-prop z-test (note: chi-square is incorrect, as the test is 1-sided!)
wrote...
2 weeks ago
For the scenario described below, simply name the procedure that is appropriate to answer the question. For example, 1-proportion z-interval or chi-square goodness of fit test. Do NOT carry out the procedure.

A national marketing campaign is conducted to improve the name-brand recognition with potential customers. The company sells household products, primarily to the female head of the household. The current market analysis shows that 23% of their customer base recognizes the name of their product. When the marketing campaign is finished, 135 people out of 500 randomly polled recognize the brand name. Does this provide statistically significant evidence that there has been an increase in name-brand recognition?
wrote...
2 weeks ago
1-prop z-test
wrote...
2 weeks ago
I appreciate what you did here, answered it correctly Smiling Face with Open Mouth
wrote...
2 weeks ago
For the scenario described below, simply name the procedure that is appropriate to answer the question. For example, 1-proportion z-interval or chi-square goodness of fit test. Do NOT carry out the procedure.

In a campus survey, a university polls its students to see how many hours they study in an average week. Females reported an average of 16.8 hours, while males reported an average of 13.8 hours. Find a 95% confidence interval for the difference in average time spent studying by females compared to males.
wrote...
2 weeks ago
2-mean t-interval
wrote...
2 weeks ago
For the scenario described below, simply name the procedure that is appropriate to answer the question. For example, 1-proportion z-interval or chi-square goodness of fit test. Do NOT carry out the procedure.

A student in Southern California notes that the temperature is generally cooler at the beach than it is at his home, 25 miles inland. He collects data every day for month, noting the high temperature at the beach and the high temperature at his house. He then conducts a test to see if there is a significant relationship between these two variables.
wrote...
2 weeks ago
Linear regression t-test for slope
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