Quiz about Statistics 4th quarter

Question 1

The numerical measure that describes the certain characteristics of a population is called ______________.

Accepted Answer

parameter

Answer

sample

Answer

statistics

Answer

population

Question 2

What are the two common parameters of normal distribution?

Accepted Answer

Question 3

Which of the following denotes the true value that would be obtained if a census rather than a sample was undertaken?

Accepted Answer

parameter

Answer

sample

Answer

statistic

Answer

population

Question 4

Which of the following is NOT a parameter?

Accepted Answer

Question 5

Which of the following symbols is used for population variance?

Accepted Answer

Question 6

This hypothesis states that there is no difference between population parameters and the hypothesized value.

Accepted Answer

null hypothesis

Answer

hypothesis

Answer

alternative hypothesis

Answer

two-tailed hypothesis

Question 7

When the value of parameter has significant difference with the hypothesized value, then it is called ________________.

Accepted Answer

alternative hypothesis

Answer

one-tailed test

Answer

two-tailed test

Answer

null hypothesis

Question 8

The sign of the alternative hypothesis in a left-tailed test is always_________.

Accepted Answer

less than

Answer

Equal

Answer

not equal

Answer

greater than

Question 9

What kind of hypothesis is illustrated below? The mean score of all Grade 11 students is higher than 75.

Accepted Answer

alternative hypothesis

Answer

one-tailed test

Answer

two-tailed test

Answer

null hypothesis

Question 10

If the variance is known, what test statistic is appropriate?

Accepted Answer

z-test

Answer

t-test

Answer

two-tailed test

Answer

one-tailed test

Question 11

Based on the Central Limit Theorem, when the sample (n) is extremely large and the variance is unknown, what is the statistical test to be used?

Accepted Answer

z-test

Answer

t-test

Answer

two-tailed test

Answer

one- tailed test

Question 12

Which of the following is NOT a consideration in using z-test/statistic?

Accepted Answer

The population mean is less than 30.

Answer

Variance is known.

Answer

Sample standard deviation is known.

Answer

Population standard deviation is known.

Question 13

Which of the following defines the area encompassed by the values not included in the non-rejection region or also the area of the tails of the distribution?

Accepted Answer

rejection region

Answer

critical value

Answer

level of significance

Answer

population variance

Question 14

If the level of significance decreased from 0.1 to 0.05, then the boundaries for the critical region move farther away from the center of the distribution.

Accepted Answer

true

Answer

false

Answer

both A and B

Answer

cannot be determined

Question 15

In a right-tailed test, the rejection lies in the ________ tails of distribution.

Accepted Answer

right

Answer

up

Answer

left

Answer

down

Question 16

What test statistic will be used if the sample size is below 30?

Accepted Answer

t-test

Answer

z-test

Answer

population mean

Answer

standard deviation

Question 17

In using t-test for a population mean, we assume that the sample is selected randomly. The given statement is:

Accepted Answer

always true

Answer

always false

Answer

sometimes true

Answer

sometimes false

Question 18

If the population standard deviation is unknown, what test statistic is to be used?

Accepted Answer

t-test

Answer

z-test

Answer

population mean

Answer

standard deviation

Question 19

In finding the t-computed value, which formula should be used?

Accepted Answer

Question 20

When should you use the z-test?

I. When you are testing for a population mean

II. When the population standard deviation is given

III. When the sample standard deviation ONLY is given

IV. When you are testing with small sample sizes, n < 30.

Accepted Answer

I and II

Answer

II and III

Answer

II and IV

Answer

I and III

Question 21

Milky Milk is sold in packets with an advertised mean weight of 0.5kgs. The standard deviation is known to be 0.11 kilograms. A consumer group wishes to check the accuracy of the advertised mean and takes a sample of 36 packets finding an average weight of 0.47kgs. What test statistic should be used?

Accepted Answer

z-test

Answer

t-test

Answer

population mean

Answer

standard deviation

Question 22

Milky Milk is sold in packets with an advertised mean weight of 0.5kgs. The standard deviation is known to be 0.11 kilograms. A consumer group wishes to check the accuracy of the advertised mean and takes a sample of 36 packets finding an average weight of 0.47kgs. What is the sample size?

Accepted Answer

36

Answer

0. 15

Answer

0. 48

Answer

0. 5

Question 23

What is the critical value in a two-tailed test with 10% level of significance and a degree of freedom of 18?

Accepted Answer

1.734

Answer

2.575

Answer

2.326

Answer

1.960

Question 24

If the computed value is greater than the critical value, then we ______________.

Accepted Answer

reject the null hypothesis

Answer

retain the null hypothesis

Answer

support the null hypothesis

Answer

fail to reject the null hypothesis

Question 25

What does it mean when we failed to reject the null hypothesis?

Accepted Answer

There is an insufficient evidence to disprove the null hypothesis

Answer

The null hypothesis is correct

Answer

The alternative hypothesis is incorrect

Answer

There is a sufficient evidence to support the null hypothesis

Question 26

If the t-computed value is 2.115 and the critical value is 2.423, what will be the decision?

Accepted Answer

Do not reject the null hypothesis.

Answer

Reject the null hypothesis.

Answer

Reject both the null and alternative hypotheses.

Answer

Support both the null and alternative hypotheses.

Question 27

On the given figure below, the t-computed value is 1.217. What conclusion can be drawn?

Accepted Answer

Fail to reject the null hypothesis

Answer

Reject the null hypothesis

Answer

Reject both the null and alternative hypotheses

Answer

Support both the null and alternative hypotheses

Question 28

When we fail to reject the null hypothesis, which of the following statements is true?

Accepted Answer

There is no sufficient evidence suggesting that the claim is false.

Answer

The conclusion is guaranteed.

Answer

The conclusion is not guaranteed.

Answer

There is a sufficient evidence to back up the claim.

Question 29

If the z-computed value is 1.253 and the critical value is 1.645, what will be the decision?

Accepted Answer

Do not reject the null hypothesis

Answer

Reject the null hypothesis

Answer

Reject both the null and alternative hypotheses

Answer

Support both the null and alternative hypotheses

Question 30

On the given figure, the z-computed value is 2.431. What conclusion can be drawn?

Accepted Answer

Reject the null hypothesis

Answer

Fail to reject the null hypothesis

Answer

Reject both the null and alternative hypotheses

Answer

Support both the null and alternative hypotheses

Question 31

In a right-tailed test, if the critical value is greater than the computed value, then we __________________________________.

Accepted Answer

fail to reject the null hypothesis

Answer

reject the null hypothesis

Answer

reject both the null and alternative hypotheses

Answer

support both the null and alternative hypotheses

Question 32

What should you do if the computed t-value lies in the critical region?Reject the null hypothesis

Accepted Answer

Reject the null hypothesis

Answer

Fail to reject the null hypothesis

Answer

Reject both the null and alternative hypotheses

Answer

Support both the null and alternative hypotheses

Question 33

The null hypothesis is rejected. What does it mean?

Accepted Answer

There is enough evidence against the null hypothesis.

Answer

The null hypothesis is incorrect.

Answer

The alternative hypothesis is true.

Answer

There is a very small probability that the null hypothesis is true.

Question 34

If the t-computed value is 2.430 and the critical value is 2.011, what will be the decision?

Accepted Answer

Reject the null hypothesis

Answer

Support the null hypothesis

Answer

Reject the alternative

Answer

Do not reject the null hypothesis

Question 35

What is the third step in the hypothesis testing procedure?

Accepted Answer

Find the critical value for the test; then draw the critical region.

Answer

Draw conclusion.

Answer

. State the null and alternative hypotheses.

Answer

Determine the test statistic and compute it.

Question 36

In a left-tailed test, what will you do if the critical value is less than the computed value?

Accepted Answer

Do not reject the null hypothesis.

Answer

Reject the null hypothesis.

Answer

Reject the alternative hypothesis

Answer

Do not reject the alternative hypothesis.

Question 37

The t-computed value is 1.875 and the critical value is 2.080. What conclusion can be drawn?

Accepted Answer

Fail to reject the null hypothesis

Answer

Reject the null hypothesis

Answer

Reject the alternative hypothesis

Answer

Fail to reject the alternative hypothesis

Question 38

What does it mean if a result is said to be significant at 1% level?

Accepted Answer

There is a 1% probability that a true null hypothesis is rejected.

Answer

The null hypothesis is 99% true.

Answer

The null hypothesis is 99% wrong.

Answer

We fail to reject the false null hypothesis 1% of the time.

Question 39

It is a value that separates the acceptance region from the rejection region in a normal curve when testing the hypothesis?

Accepted Answer

critical value

Answer

t-value

Answer

z-value

Answer

computed value

Question 40

What should you do if the computed z-value lies in the critical region?

Accepted Answer

Reject the null hypothesis

Answer

Reject the alternative hypothesis

Answer

Do not reject the null hypothesis

Answer

Do not reject the alternative hypothesis

Question 41

In the hypothesis testing procedure, drawing conclusion should always be the __________ step.

Accepted Answer

fourth

Answer

first

Answer

second

Answer

third

Statistics 4th quarter

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