Deneme Sınavı Soruları

How many different subgroups of 5 members can be obtained from a population of 8 members?

Which of the following is not one of the reasons for sampling from a population?

What is the rejection region if the alternative hypothesis is in the form of H1 : µ1 < µ2 ?

Interval estimation : the limits of the confidence interval are (205, 245), the significance level is 0.05. What is the sample arithmetic mean?

Sample values for a continuous variable (electric current at home ; as amper) : 2, 3, 6, 9, 10, and 18. What is the point estimate of the population arithmetic mean?

For age variable the following sample data is gathered: 45, 47, 42, 40, and 51. What is the point estimate of the population arithmetic mean for variable age?

I. A population should be finite

II. Sometimes sample may be bigger than population

III. Using a proper sample surveyors may make very accurate prediction

Which one(s) of the above is/are true?

For the means of two normal distributions, what is the null hypothesis for two sided (two tailed) test?

Which sampling method should be chosen when each possible sample combination of the specified size required to has equal probability of being chosen?

In Interval estimation problem : the population standard deviation is not known, the sample standard deviation is 50, there are 25 observations in the sample. What is the value of the standard error to calculate the confidence interval?

A researcher decides to use systematic sampling. The population to be researched has a member of 3.380 and the sample size is 65 units. If the researcher starts sampling form the 15th unit, which of the following is one of the units to be sampled?

 What does the term '1-β' indicate?

Assume that there are two different brands (A and B) producing chocolates. The variance of chocolates are assumed to be different. One chooses 10 chococaltes of brand A and 20 chocolates of brand B and observes that the average weight of brand A sample is 56 gr and brand B is 54 gr. The sample variances for A and B are 1 and 2 gr respectively. What will be the t-statistic and can we conclude that the weights of these brands are different at 0.05 significance level?

What is a value that defines the characteristic of a whole population called?

Interval estimation : the limits of the confidence interval are (4.1, 5.9), the significance level is 0.05. What is the sample arithmetic mean?

(Answer the question 7, 8 and 9 according to those information)

Consider the following hypothesis:

H0: μ = 80

H1: μ ≠ 80

A random sample of 16 observations is randomly selected from normally distributed population. The mean of the sample is 90 and the standard deviation of the sample is 5. Test the null hypothesis given above with %95 confidence level.

What is the critical value for that test procedure?

The frequency of recovery from illness after therapy A in a sample of 640 is 160. What is the point estimate of population proportion for recovery from illness?

Which of the following is the null hypothesis for the right sided (upper tailed) test ?

In Interval estimation problem: the sample arithmetic mean is 26 and the upper limit of the confidence interval is 33, then what is the lower limit of the confidence interval?