Statıstıcs Iı Ara 1. Deneme Sınavı

1.Soru

For two-sided test with ? = 0.05 and n = 15, what is the degrees of freedom?

15,05

1,05

14

15

16

2.Soru

The population variances for two samples are 2 and 5, the difference of the sample means for these two samples is 3, and the sample sizes are 100 and 500, respectively. For the given values what is the test statistic?

10

20

30

40

50

3.Soru

In a population there are 5 observations, how many different samples of size 4 can be created from this population?

1

3

5

8

15

4.Soru

Which of the given forms of hypothesis equivalently is one that is correct?

H₀: µ₁ = µ₂
H₁: µ₁ ≠ µ₂

H₀: µ₁ = µ₂
H₁: µ₁ = µ₂

H₀: µ₁ = µ₂
H₁: µ₁ - µ₂ =0

H₀: µ₁ < µ₂
H₁: µ₁ > µ₂

H₀: µ₁ - µ₂ = 1
H₁: µ₁ ≠ µ₂

5.Soru

If a researcher fails to reject the null hypothesis (H₀) and the H₀is false what can be said?

Type I error (α)

Type II error (β)

Correct decision

Not enough information

Too much information

6.Soru

There are 40 observations in a population. A sample of 4 observations are to be selected randomly using a table of random numbers. Here are the the random numbers obtained from the table of random numbers: 55, 34, 67, 89, 12, 23, 89, 78, 18, 99, 92, 16, 45, and 10. In which random number the selection of the sample should be finished?

67

78

92

16

18

7.Soru

Sample values for a continuous variable (phone charger output voltage ; as volt) : 4.4, 5.6, 4.5, and 5.5. What is the point estimate of the population arithmetic mean?

4.6

4.8

5.0

5.2

5.4

8.Soru

What will be the variance of defect trucks produced by a factory if 10 of every 100 trucks are defect?

0.90

0.45

0.10

0.09

0.01

9.Soru

For the one-way ANOVA test, the test statistic is the ratio of two variances: namely the variance between _ and the variance within __.

Which option completes the blanks above?

variables

independent variables

dependent variables

samples

hypotheses

10.Soru

What is also called availability sampling method?

Snowball Sampling

Quota Sampling

Simple random

Stratified

Convenience Sampling

11.Soru

For the left sided (lower tailed) test for two population means, how do we write the alternate hypothesis?

µ1 - µ2 =0

µ1 > µ2

µ1 < µ2

µ1 <! µ2

µ1 !> µ2

12.Soru

How many types of statistical hypotheses are there?

One

Two

Three

Four

Five

13.Soru

The frequency of completion of Eskişehir Porsuk river swimming marathon in a sample of 180 is 72. What is the point estimate of population proportion for completion of swimming marathon?

0.90

0.85

0.40

0.35

0.18

14.Soru

In a two population hypothesis testing problem, if you draw the normal distribution with critical values, what do we call the inside of the critical values?

H0 rejection region

Shaded region

H1 acceptance region

H0 acceptance region

No region

15.Soru

In a research, 5 of 20 schools of university A were selected at random. 2 classes of each of the 5 schools were chosen at random. Then, 3 courses were selected from each class at random. Which type of sampling methods was used in this research?

convenience

multi stage

simple random

stratified

systematic

16.Soru

Which of the following about F Test is true?

The F test to compare more than two population means is always a left tailed test.

The F test to compare more than two population means is always a right tailed test.

For the F test procedure, the sample sizes need to be equal.

If F test statistic value is greater than 1, the alternate hypothesis should be rejected.

If F test statistic value is greater than 1, both hypotheses should be rejected.

17.Soru

In stratified sampling method, the target population is divided into homogenous subgroups which are called _________________ ?

A data value

Strata

Sampling

Stratum

Population

18.Soru

In a population there are 5 observations as follows: 10, 90, 20, 80, 50. What is the arithmetic mean of the sampling distribution of the sample mean with sample size with 2 observations?

50

80

90

10

100