Statıstıcs II (ENG)
Ünite Sınavı Soruları
- 10 soru
- Soru metinleri açık; şıklar ve cevap anahtarı uygulamada
- 1
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?
- 2
How many types of statistical hypotheses are there?
- 3
In hypothesis testing, which of the steps below is the first to be followed?
- 4
Which of the following is true about t distribution?
- 5
According to the given information at Question 7;
What is the calculated test statistics for that hypothesis test?
- 6
What is the third step of hypothesis testing?
- 7
In a production line, the mean weight of the products should be 450 grams and the standard deviation of 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.The significance level α = 0.05 for this problem.
If you follow the five step hypothesis testing procedure, what is the alternative hypothesis for the situation given above ?
- 8
Which sign we are not going to use in one sample hypothesis problems for alternate hypothesis?
- 9
In a hypothesis testing procedure, the population mean and standard deviation are 800 and 200 respectively. On the other hand, sample arithmetic mean of a random sample of 225 observations is 950. If this procedure is followed, what is the value of the observed z?
- 10
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?