Statıstıcs II (ENG)
Deneme Sınavı Soruları
- 20 soru
- Cevap anahtarı açık: çöz, sonucunu gör
- 1
In a two population hypothesis testing problem, population standard deviations are 40 and 30, sample sizes are 125 and 225 respectively. If the z value is calculated, what is the value of denominator for z?
- 2
Which of the following is the sampling method based on identifying the samples by the former samples selected?
- 3
The process of estimating a population parameter by a single number derived from the sample is called _______________ estimation?
- 4
___________ of the sample mean is the probability distribution of all possible sample means that can be created from a population with a fixed sample size of n?
- 5
In order to compare more than two means, which of the following statistical analysis can be carried out?
- 6
In stratified sampling method, the target population is divided into homogenous subgroups which are called _________________ ?
- 7
Sample values for a continuous variable (rain drop rate ; as kg / hour) : 110, 125, 155, 130, 180, and 80. What is the point estimate of the population arithmetic mean?
- 8
The members, who are identified previously, are asked to identify other members of the population. Newly identified members name others.
Which method of sampling is described above?
- 9
Why to use a sample instead of a census to obtain some information about the characteristics of a population?
- 10
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?
- 11
In a market, a chef selects the first 5 vegetables he sees in the fresh vegetable boxes as her test samples. Which type of sampling method does the chef use?
- 12
In hypothesis testing, which of the steps below is the first to be followed?
- 13
What is the third step of hypothesis testing?
- 14
___________________________, denoted by π, is the proportion of the members/objects/individuals of a population that have a specific characteristic of interest?
- 15
The frequency of 3 point field goals of a basketball player in a sample of 360 is 216. What is the point estimate of population proportion for 3 point field goals of this basketball player?
- 16
In an investigation, if the significance level is 0,01 ; what is the confidence level of this study ?
- 17
I. The null hypothesis defines what the decision maker’s conclusion is if he/she accepts the alternative hypothesis.
II. The null hypothesis H0 is a statistical statement which specifies that there is a specific value of a population parameter.
III. The alternative hypothesis H1 specifies that there is a difference between the value of a population parameter and a certain value.
Which of the given statements can be said about the null and alternative hypotheses?
- 18
Which one of the following is also called availability sampling method?
- 19
what is the last step of hypothesis testing?
- 20
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 _______.