Question

In: Statistics and Probability

7. A researcher was once criticized for falsifying data. Among his data were figures obtained from...

7. A researcher was once criticized for falsifying data. Among his data were figures obtained from 55 groups of rats, with 44 individual rats in each group. These values were given for the percentage of successes in each group: 53%, 58%, 63%, 46%, 48% nothing. What's wrong with those values?

A. All percentages of success should be multiples of 5. The given percentages cannot be correct.

B.All percentages of success should be multiples of 4.The given percentages cannot be correct.

C.All percentages of success should be multiples of 25. The given percentages cannot be correct.

D.All percentages of success should be multiples of 8. The given percentages cannot be correct.

8. Determine whether the underlined number is a statistic or a parameter. In a study of all 4229 employees at a college, it is found that Modifying 45 % with underline own a computer.

A. Parameter because the value is a numerical measurement describing a characteristic of a population.

B. Statistic because the value is a numerical measurement describing a characteristic of a population.

C. Statistic because the value is a numerical measurement describing a characteristic of a sample.

D. Parameter because the value is a numerical measurement describing a characteristic of a sample.

9. Determine whether the value given below is from a discrete or continuous data set. In a test of a method of gender selection comma 683 couples used the XSORT method and 528 of them had baby girls.

A. A continuous data set because there are infinitely many possible values and those values can be counted can be counted.

B. A discrete data set because there are a finite number of possible values

C.A continuous data set because there are infinitely many possible values and those values cannot be counted

D.The data set is neither continuous nor discrete.

10. Determine whether the value is from a discrete or continuous data set.

Number of coins in a jar is 78

Is the value from a discrete or continuous data set?

A. Continuous

B. Discrete

11. Determine whether the description corresponds to an observational study or an experiment.

Thirty university students are divided into two groups. One group receives free tutoring in mathematics, the other doesn't. After one semester, scores on final mathematical examinations are compared.

Does the description correspond to an observational study or an experiment?

A. Observational study

B. Experiment

Expert Solution

Solution:

7. A researcher was once criticized for falsifying data. Among his data were figures obtained from 5 groups of rats, with 4 individual rats in each group. These values were given for the percentage of successes in each group: 53%, 58%, 63%, 46%, 48% nothing. What's wrong with those values?

Answer: C.All percentages of success should be multiples of 25. The given percentages cannot be correct.

8. Determine whether the underlined number is a statistic or a parameter. In a study of all 4229 employees at a college, it is found that Modifying 45 % with underline own a computer.

Answer: A. Parameter because the value is a numerical measurement describing a characteristic of a population.

9. Determine whether the value given below is from a discrete or continuous data set. In a test of a method of gender selection comma 683 couples used the XSORT method and 528 of them had baby girls.

Answer: B. A discrete data set because there are a finite number of possible values

10. Determine whether the value is from a discrete or continuous data set.

Number of coins in a jar is 78

Is the value from a discrete or continuous dataset?

Answer: B. Discrete

Because the variable can take the countable number of values between any two values

11. Determine whether the description corresponds to an observational study or an experiment.

Thirty university students are divided into two groups. One group receives free tutoring in mathematics, the other doesn't. After one semester, scores on final mathematical examinations are compared.

Does the description correspond to an observational study or an experiment?

Answer: B. Experiment

Because the experimenter has control over one group to determine the effect of tutoring

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