Statistics - Introductory Statistics, Quizlet 2

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About 70% of babies born with a certain ailment recover fully.A hospital is caring for six babies born with thiss ailment. The random variable represents the number of babies that recover fully.Decide whether the experiment is a binomial experiment. If it is identify a success, specify the values of n, p, and q, and list the posssible values of the randdom variable x. Is the experiment a binomial experiment?

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Explain what is meant when it is said that "data vary". How does the variability affect the results of statistical analysis?

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A. Saying "data vary" means that observations can be measured with fractions or decimals instead of only integers. Because data vary, it is important to make sure to accurately account for fractional observations.
B. Saying "data vary" means that the values of the variable change from individual to individual. In addition, certain variables can change over time for certain individuals. Because data vary, two different statistical analysis of the same variable can lead to different results.
C. Saying "data vary" means that the values of the variable change every time they are observed. Because data vary, each statistical analysis of a given variable will lead to different results.
D. Saying "data vary" means that examining different types of subjects will yield different data, such as examining a person and examining a car. Because data vary, it is impossible to compare different types of subjects, such as comparing people and cars.

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Which of the following must be true about the range on a Chi-Square random variable?

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The intersection of two events A and B, denoted by A∩B , ______

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Of the 47 novels written by a certain author, 25 were mysteries, 13 were romances, 8 were satires, and 1 was a fantasy novel. One novel is randomly selected from these 47 novels. Find the odds against selecting a romance or a fantasy novel.

6

A die was rolled 200 times and a record was kept of the numbers obtained. The results are shown in the relative frequency histogram below.

7

Compute the standard deviation of the defective parts produced in an hour by the company’s production line.

8

If the treatment actually has an effect, but you get a mean value that is quite similar to the mean for the population (that didn’t get the treatment). What outcome is likely if this happens?

9

Calculate SP (the sum of products of deviations) for the following scores. (Note: Both means are whole numbers, so the definitional formula works well.)

10

A local TV station claims that 60% of people support Candidate A, 30% support Candidate B, and 10% support Candidate C.

11

The waiting time for customers at MacBurger Restaurants follows a normal distribution with a population standard deviation of 1 minute. At the Warren Road MacBurger, the quality-assurance department sampled 50 customers and found that the mean waiting time was 2.75 minutes. At the 0.05 significance level, can we conclude that the mean waiting time is less than 3 minutes?

12

A recent national survey found that high school students watched an average (mean) of 6.8 DVDs per month with a population standard deviation of 1.8 DVDs. The distribution of DVDs watched per month follows the normal distribution. A random sample of 36 college students revealed that the mean number of DVDs watched last month was 6.2. At the .05 significance level, can we conclude that college students watch fewer DVDs a month than high school students?

13

If a random sample of 81 ZX-900s have a mean stopping distance of x⎯⎯=57.8 ft, will National Motors be allowed to advertise the claim?

14

If µ equals 6, what percentage of all possible sample means are less than or equal to 5.38? What do you conclude about whether the new system has reduced the typical customer waiting time to less than 6 minutes?

15

The work of W. E. B. Du Bois, an African American, __________.

16

Common sense __________.

17

The _______ is made up of people who are in the portion of the population being studied.

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Applying symbolic interactionism, as divorce became more common, divorce became __________.

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The __________ uses objective, systematic observations to test theories.

20

Durkheim's concept of _______ refers to how much people are tied to their social groups.

21

Robert Merton would say negative results of people's actions are __________.

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__________ are the people who respond to a survey.

23

Professional handling of confidential sociological field notes entails __________.

24

The subjects exposed to an independent variable in an experiment are in the __________.

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__________ is a precise way to measure a variable.

26

Pure sociologists analyze some aspect of society to __________.

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Statistics - Introductory Statistics, Quizlet 2

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