Deneme Sınavı Soruları

The price of a certain electronic product at a chain store is 180 TL. The same electronic product is also available through various online stores and five of the store prices are as follows: 155, 179, 175, 175, 161 TL. Let’s assume that online prices are normally distributed and  at the significance level α = 0.1. 

Given the information above, what can we conclude about the mean online store price of the product?

The titles of term projects for psychology course were written separetely on pieces of papers then placed in a black box. Then, student A selected 2 papers from the box. Which type of sampling methods was used in this sampling ?

Which of the following is NOT a statistical hypothesis?

Which one of the following investigations must definitely use sampling?

A researcher wants to conduct a survey to determine the infertility rate in females over 30 years of age living in Turkey. Which of the following is the true target population for this research?

I. The alternative hypothesis can be expressed in three different ways according to the purpose of the research question.

II. H₁: θ ≠ θ₀  A hypothesis test whose alternative hypothesis (H₁) has this form named as the one-tailed test or one-sided alternative hypothesis.

III. Right-tailed and left tailed hypothesis tests are also called a two-tailed test or two-sided alternative hypothesis.

Which of these statements about hypothesis testing are true?

I. Quota Sampling
II. Cluster Sampling
III. Stratified Sampling

Which of the above is (or are) considered as non-probability sampling?

25, 45, 55, 35, 40

What is the estimation of the arithmetic mean of the data set given above?

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

If you want to conduct a research to assess newspaper reading habit of people older than age 30 in a particular village, and want to discuss the results according to gender, socioeconomic status (regarding the income less and more than a predetermined amount) and being a university-graduate or not, which sampling method will be the best choice?

Which one of the following is the degrees of freedom for within source of variation in F table?

A linguist interviews with speakers of a rare languge A. She selects a few speakers to start with and at the end of interview he asks if the participant knows any other speakers that might want to participate. Which type of sampling method does the manager use?

The price of a certain electronic product at a chain store is 180 TL. The same electronic product is also available through various online stores and five of the store prices are as follows: 155, 179, 175, 175, 161 TL. 

What is the null hypothesis for the problem given above?

Sample values for a continuous variable (Eskişehir Porsuk river current flow rate ; as m³ / second) : 4, 5, 8, 11, and 12. What is the point estimate of the population arithmetic mean?

In a university, a surveyor calculated the proportion of girls as 30 % and 34 % at ages 20 and 21, and proportion of boys are 26 % and 10 % of the boys at ages 20 and 21, respectively. What is the sampling method she used ?

If you reject the null hypothesis when the null hypothesis is false, what is the decision?

I. There are four possible correct and incorrect decision-making situations that may occur through statistical hypothesis testing.

II. Type I error is defined as failing to reject the null hypothesis (H₀) when it is actually false.

III.  Type II error is defined as rejecting the null hypothesis (H₀) when it is actually true.

Which of the given statements about incorrect decisions through hypothesis testing can be said to be true?

Interval estimation problem : the population standard deviation is not known, the sample standard deviation is 36, there are 9 observations in the sample. What is the value of the standard error to calculate the confidence interval?