Genetics

The biologist found evidence to reject the null hypothesis in favor of the alternative hypothesis. Which of the following represents the alternative hypothesis of the test? A) At least one of the fish proportions is different than the corresponding proportion when the lake was originally stocked. B) The proportions for the different fish types are … Read more

If the proportions of nests occupied is the same for golf and nongolf sites, what would be the expected count of birdhouses with 1 nest in nongolf locations? A) 40 B) 42 C) 50 D) 58 E) 60

In order to meet the conditions for independence and large counts for a chi-square goodness-of-fit test, which of the following represents all possible sizes of the monthly samples? A) n≥30 B) 30≤n≤50 C) 46≤n≤60 D) n≥46 E) n≤60

Assuming that all conditions for inference have been met, which of the following equations gives the appropriate chi-square test statistic and the correct number of degrees of freedom to determine if there is an association between grade level and whether a student approves of the food choices in the cafeteria? A) χ2=(50−40)240+(20−40)240+(30−40)240+(60−40)240 with 4 degrees … Read more

A local restaurant claims that it gets 45 percent of its customers from Monday through Thursday, 20 percent on Friday, 20 percent on Saturday, and 15 percent on Sunday. How many degrees of freedom should be used to conduct a chi-square goodness-of-fit test of the claim? A) 3 B) 4 C) 6 D) 7 E) … Read more

The district manager of four different restaurants wanted to investigate whether the four restaurants differed with respect to customers ordering dessert or not based on family classification (with children or without children). Independent random samples of 100 customers who ordered dessert were selected from each restaurant, and the customers were identified as either being with … Read more

Polling organizations regularly collect data on the public’s opinions and habits. A question on a recent survey asked, “How often do you purchase coffee from a coffeehouse?” There may be differences in how people respond to this question based on whether the person is a full-time student. Suppose a polling organization uses random digit dialing … Read more

Which statement is true about whether the conditions for the chi-square test for independence have been met? A) All necessary conditions are satisfied to apply a chi-square test for independence between gender and being a coffee drinker. B) The data is not the result of two independent random samples; therefore, the conditions for applying the … Read more

Which of the following is an appropriate description of the chi-square distribution? A) A chi-square distribution will only contain positive values and will be skewed right, with the skew becoming less pronounced with increasing degrees of freedom. B) A chi-square distribution will only contain positive values and will be skewed left, with the skew becoming … Read more

A random sample of 500 people were classified by their ages into 3 age-groups: 29 years and younger, 30 to 64 years, and 65 years and older. Each person from the sample was surveyed about which of 4 major brands of cell phone they used. Their responses were compiled and displayed in a 3-by-4 contingency … Read more