*****Please note that questions can have more than one correct answer. For full credit you must select all of the correct answers.

THANK YOU. (10 Q total)

1)Based on the registrar's records of every student in school, the mean age of the students at a school is 16 with a standard deviation of 1.5.Mr Smith, not knowing this, asks 50 randomly selected students how old they are and finds an average age of 14.5 with a standard deviation of 2.

group of answer choices.

The values 16 and 2 are parameters.

The values 14.5 and 2 are statistics

The value 14.5 is a statistic and 2 is a parameter

The values 14.5 and 2 are parameters.

2)If the true mean value of some characteristic of a large population is 150 and the true standard deviation of this measurement is 10, which of the following is true?

Group of answer choices

The population of sample means of size 100 will have the same mean and standard deviation as the original population.

The population of sample means of size 100 will have the same mean as the original population, but a larger standard deviation.

The population of sample means of size 100 will have the same mean as the original population, but a smaller standard deviation.

The sample means will always yield the exact value of the population mean.

3) If the true value of a population proportion is .6, the standard deviation of sample proportions based on samples of size 100 will be

Group of answer choices

.24

.6

.0024

.049

4) Based on a sample of 100 male students at a university, a researcher states he is 95% confident that the mean weight of the male students of the university is between 160 and 180 pounds.Which form of statistical inference does this represent.

Group of answer choices

Point estimation

Interval estimation

Hypothesis testing

Physical Science

5) Based on a sample of 100incoming freshman students at a university, a researcher says that there is not enough evidence to reject the notion that the mean SAT score for the incoming class is any different from that of last year's incoming freshmen.

Group of answer choices

Point estimation

Interval estimation

Hypothesis testing

Sociology

6) Suppose you run the R command x = sample(10,500,replace=TRUE).Which of he following are true?

Group of answer choices

x will be a numeric vector of length 10 containing numbers potentially up to 500.

x will be a numeric vector of length 500. All of these numbers will be between 1 and 10.

Some numbers are more likely to appear in x than others.

No number is more likely to appear in x than any other.

7) In the population of first grade students in WA the rate of vaccination for measles is about .9.If you take random samples of size 30 (about the size of a first grade class), would the distribution of estimated vaccination rates in these samples be roughly normal?

Group of answer choices

Yes, because 30 is a sample size which guarantees normaility.

Yes because all samples have normal distributions.

No, because 30 * .9 = 27

No, because 30 * .1 =

8) Suppose we increase the sample size we use to estimate a population mean by a factor of 100.

Group of answer choices

We increase the standard deviation of the sampling distribution by a facrtor of 100.

We increase the standard deviation of the sampling distribution by a facrtor of 10.

We decrease the standard deviation of the sampling distribution by a facrtor of 100.

We decrease the standard deviation of the sampling distribution by a facrtor of 10.

9) Suppose we increase the sample size we use to estimate a proportion by a factor of 25.

Group of answer choices

We increase the stanadrd deviation of the sampling distribution by a factor of 25.

We increase the stanadrd deviation of the sampling distribution by a factor of 5.

We decrease the stanadrd deviation of the sampling distribution by a factor of 25.

We decrease the stanadrd deviation of the sampling distribution by a factor of 5.

10) You have samples of various sizes which you use to estimate a population mean.In the population, the true mean is 100 and the true standard deviation is 10.With which of the following sample sizes are you most likely to seean estimated mean of 135?

Group of answer choices

Sample size 2

Sample size 1

Sample size 10

Sample size 100