Deneme Sınavı Soruları

If the correlation between two variables is 0.75, what is the coefficient of determination in this problem?

In an investigation, the monthly electricity consumption (kw) of a family of four is estimated by the size of the house (in meter squares). It is going to be a big project, but the investigator creates a pilot study with 10 family homes in a small town. Here are the data values below;

Which of the following is the simple linear regression model for the case above?

The payoff values for decision alternatives : there are 5 states of nature and minimum payoff values for 5 decision alternatives are I) 11.650, II) 10.025, III) 5.275, IV) 2.725, V) 3.450. The decision maker is pessimistic. Which decision alternative is choosen?

What kind of distribution is used when a probability of obtaining an outcome, out of two outcomes, on one trial is known and a probability of the number of times the same outcome might appear, say x times out of n independent trials is tried to be found?

The following table show the prices and quantities of 4 products. According to the value of the Laspeyres Price index for 2020 using 2015 as the base period, which of the followings shows the correct definition about the price of the product group from 2015 to 2020?

The payoff values for decision alternatives : there are 5 states of nature and minimum payoff values for 5 decision alternatives are I) 1.150, II) 1.025, III) 1.275, IV) 1.725, V) 1.450. The decision maker is pessimistic. Which decision alternative is choosen?

Total price for products group A is 14 and 16 units for months X and Y, respectively. What is the simple aggregate price index for A for month X when month Y is the base?

The table given above indicates the correlation coefficients between A, B, C and D variables. According to those correlations, which one of the following statement is wrong? 

The payoff values for decision alternatives : there are 6 states of nature and the cost values for the first decision alternative are 960, 710, 450, 610, 430, 580. The decision maker is optimistic. Which payoff value is taken from the first decision alternative?

Which one of the following statements is true?

Which index is known as the average of weighted relative prices since it is a composite index number of prices formed by the weighted sum method?

What is the name of the nonparametric test that is used for the hypothesis test about the population median?

A road traffic safety research study examined winter tire use in the passenger cars in two nearby cities. Number of the cars examined in city 1 are 100 (n1 ) and 60 of the cars have winter tires. On the other hand, in the city 2,120 (n2 ) passenger cars are examined and 78 of the cars have winter tires. What is the alternate hypothesis?

In a factory there are 10,000 workers. %70 of workers are male. If we make a random sample of 200 proportional to the gender, how many of sample points should be female?

Which test statistic do we use when the population variances are unkonwn and the sample size is smaller than 30?

1. Formulate a decision rule

2. Identify the test statistic 

3.  State null and alternate hypotheses

4. Select a level of significance

5. Take a sample and make the decision

What is the correct order of the hypothesis testing steps given above? 

In a problem, the population arithmetic mean is estimated via interval estimation, after some calculations, the sample mean is found as 45 and the lower limit of the interval is 40, therefore what is the upper limit of the interval estimate of the population arithmetic mean?