Deneme Sınavı Soruları

There are 24 female ducks, 21 male ducks, 15 baby ducks, 27 female gooses, 18 male gooses, and 12 baby gooses in a farm. What is the population proportion estimate of babies in this farm?

There are two types of incorrect decisions through hypothesis testing. Which of the following describes "type I error"?

A chocolate factory is examining the sales of their new brand chocolates in two nearby cities. The number of chocolates sold in city 1 is 300 (n1) and 120 of the chocolates were their new brand chocolates. On the other hand, in the city 2, 240(n2) of the sold chocolates, 150 of them were their new brand chocolates. What is the test statistics? ([(1/300) + (1/240)] can be assumed to be equal to 0.25)

Which of the following is correct about the sampling process?

What is the indicator of the precision for an estimation of a population parameter with a given sample size and alpha?

Population of statistics students is 500, population of statistics 201 course is 150 (40 are repeating only this), population of statistics 203 course is 160 (55 are repeating only this), population of statistics 305 course is 140 (35 are repeating only this). How many people are there in the target population for a survey about repeating 2nd year courses?

Multistage sampling is an extension of _______

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 for all the samples with the size 2?

In an interval estimation problem for population arithmetic mean; z =1.96, population standard deviation =12, n=16 and sample arithmetic mean = 28. What is the upper limit of the confidence interval for population mean?

For α = 0.567 significance level what is the rejection area under the standard normal curve for one-sided tests?

A researcher wants to collect data about drug users and knows a few of them. The researcher asks identified subjects to recruit other members and this process is repeated until the determined sample size is achieved. This researcher uses _______.

In which of the following sampling methods subgroups occur naturally (such as departments of a company)?

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?

Which one of the following is not one of the reasons of sampling?

Sample values for a continuous variable (water flow rate ; as liter / hour) : 6, 12, 17, 36, 26, 15, 34, and 2. What is the point estimate of the population arithmetic mean?

In a two population hypothesis testing problem, the sample arithmetic means are 45 and 80. If the z value is calculated, what is the value of numerator for z?

Which one of the following investigations must definitely use sampling?

There are 5 Aegean big fishes, 12 Aegean medium fishes, 19 Aegean small fishes, 9 Mediterranean big fishes, 16 Mediterranean medium fishes, and 23 Mediterranean small fishes in an aquarium. What is the population proportion estimate of big fishes in this aquarium?

In a two population hypothesis testing problem, the alternate hypothesis sign is not equal and the level of significance 0.05, what is the theoretical value of z from standard normal distribution?

I. Random numbers can be used to select simple random samples from a population frame. 

II. Each possible sample combination of the specified size does not have equal probability of being chosen. 

III. It is the most basic sampling method.

Which of the given is TRUE about simple random sampling?