Statıstıcs II (ENG)
Deneme Sınavı Soruları
- 20 soru
- Cevap anahtarı açık: çöz, sonucunu gör
- 1
In Eskisehir, 10 students were selected randomly from each of 3 universities to participate in a survey. Which type of sampling method was used?
- 2
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?
- 3
if you want to take a random sample from the population, what should be done for an accurate sample?
- 4
Which sampling method relies on naturally occurring group of units in the population?
- 5
An investigators wants to compare two population proportions. He collects the following information
Population 1 : sample size is 40, observed number of data in sample is 5
Population 2: sample size is 60, observed number of data in sample is 10
What is the overall proportion in this problem?
- 6
In a social experiment about drug abuse in young population, researchers have difficulities to list the population, even to reach them. Which sampling method should they use for the research?
- 7
The weight variable is σ = 25. It is known that the distribution of the weights of the packages follow a normal distribution. A sample of 32 observations is randomly selected from the production line in the afternoon and the sample average is found as of 448 grams.
What should be alternate hyphothesis in this situation?
- 8
- Identify the test statistic
- Select a level of significance
- State null and alternate hypotheses
- Take a sample and make the decision
- Formulate a decision rule
Which one of the following alternatives indicate the correct order of hypothesis testing steps?
- 9
What will be the degrees of freedom for two samples whose sample sizes are "m" and "n" and if the population variances are assumed to be equal for testing the difference between two means?
- 10
Population of university A is 20000, population of engineering students is 5000 (25 % take statistics course), population of psychology students is 400 (25 % take statistics course), population of statistics students is 400. How many people are there in the target population for a survey about statistics courses?
- 11
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?
- 12
Which of the following is true about the population?
- 13
In a problem, the variance between samples is 350 and variance within samples is 70. What is the test statistic F according to this information?
- 14
Sample values for a continuous variable (sea water temperature in a day ; as oF) : 70, 71, 72, 76, 77, and 78. What is the point estimate of the population arithmetic mean?
- 15
In a one-way analysis of variance the number of groups is 8, what is the degrees of freedom for between source of variation?
- 16
if the type I error is 0.05 and a two-sided hypothesis testin is investigated, what is the z value from the standard normal distribution table?
- 17
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?
- 18
An investigator has created a sample arithmetic mean and used the number found as the population parameter value, What kind of estimation is used in this process?
- 19
___ _____________________ includes similar distribution of important characteristics (e.g., age, gender, marital status, health status) with the distributions of those characteristics in the population?
- 20
If you can assign a probability to each object in the population to be selected in to a sample, what kind of sampling is used?