Chapter 11: Q.55 (page 730)
The degrees of freedom for the chi-square test for this two-way table are (a) .
(b) .
(c) .
(d) .
(e) None of these.
Short Answer
The degree of freedom is . Therefore, the correct option is (a).
Chapter 11: Q.55 (page 730)
The degrees of freedom for the chi-square test for this two-way table are (a) .
(b) .
(c) .
(d) .
(e) None of these.
The degree of freedom is . Therefore, the correct option is (a).
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Calculate the chi-square statistic for Joey’s sample. Show your work
Market research Before bringing a new product to market, firms carry out extensive studies to learn how consumers react to the product and how best to advertise its advantages. Here are data from a study of a new laundry detergent. The participants are a random sample of people who don’t currently use the established brand that the new product will compete with. Give subjects free samples of both detergents. After they have tried both for a while, ask which they prefer. The answers may depend on other facts about how people do laundry.
(a) How are laundry practices (water hardness and wash temperature) related to the choice of detergent? Make an appropriate graph to display this relationship. Describe what you see.
(b) Determine whether or not the sample provides convincing evidence that laundry practices and product preference are independent in the population of interest
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Test the null hypothesis that each flavour of Kellogg's Froot Loops is distributed evenly throughout the population. Perform a follow-up analysis if you discover a noteworthy result.
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(a) Make a two-way table of temperature by outcome (hatched or not). Calculate the proportion of eggs in each group that hatched. The researchers believed that eggs would not hatch in cold water. Do the data support that belief?
(b) Are the differences between the three groups statistically significant? Give appropriate evidence to support your answer
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