Deneme Sınavı Soruları

A random sample of 410 from two class in a high school is chosen. 250 of the students is selected from class (A) and their particular subject's mean test score is 70 with a standard deviation of 5. The rest of the students is selected from class (B) and their mean test score is 65 with a standard deviation of 4. At the 1% significance level, can we conclude that class (A) mean test score is better than the class (B)?

For a statistical test following a normal distribution, the alternative hypothesis is that the mean equals to a thousand and the standard deviation is σ = 24.  A sample of 576 observations is randomly selected and the sample average is equal to 1020. What is the test statistic equal to?

What is the female proportion of a sample with 30 males from a group of 120 students? 

Which one of the following is the degrees of freedom for between source of variation in F table?

The frequency of completion of Eskişehir Porsuk river swimming marathon in a sample of 180 is 72. What is the point estimate of population proportion for completion of swimming marathon?

Interval estimation : the sample arithmetic mean is 87 and the lower limit of the confidence interval is 78, then what is the upper limit of the confidence interval?

What is the critical value z for one-sided test with %90 confidence level?

For a statistical test following a normal distribution, the alternative hypothesis is that the mean equals to a hundred and the standard deviation is s = 20.  A sample of 25 observations is randomly selected and the sample average is equal to 102. What is the test statistic equal to?

In an investigation, the probability of failing to reject the null hypothesis (H0) when it is false is 0.05. What is the test power in this study?

In a population there are 5 observations, how many different samples of size 4 can be created from this population?

Which one of the following is a nonprobability sampling method?

In stratified sampling method, the target population is synthetically divided into homogenous subgroups based on some characteristics. Which of the following is the correct term for these homogeneous subgroups?

Sample values for a continuous variable (noise level in Anadolu University Botanic Garden ; as decibel) : 21, 29, 34, 50, 55, 62, and 71. What is the point estimate of the population arithmetic mean?

Interval estimation : the sample arithmetic mean is 14 and the lower limit of the confidence interval is 6, then what is the upper limit of the confidence interval?

A researcher wants to decide whether the average Statistics 101 course exam scores of students of faculty of engineering and faculty of natural sciences are same or not. He takes 60 students from faculty of engineering whose average exam score is 59, and 50 students from faculty of natural sciences whose average score is 65. The variance regarding the exam scores for engineering faculty is 15, and that for natural sciences faculty is 10. What will be the z-statistics for this comparison?

Sample values for a continuous variable are as follows (laptop computer's temperature in an hour ; as ^oC) : 42, 45, 47, 54, and 58. What is the point estimate of the population arithmetic mean?

A qualitative survey was conducted to find out how contended 3rd year medical students are with distance learning instead of conventional methods in Europe. 250 students were included in the study from different European countries. Concerning statistical terminology, which of the following matching is true?

In an F test, if between sum of squares is 48 and the degrees of freedom is 8, what is the between mean squares?

If a researcher fails to reject the null hypothesis (H₀) and the H₀ is false what can be said?