Ünite Sınavı Soruları

In a problem, the variance between samples is 200 and the test stastic F is 2. What is the variance within samples?

Assume that there are two different brands (A and B) producing chocolates. The variance of chocolates are assumed to be different. One chooses 10 chococaltes of brand A and 20 chocolates of brand B and observes that the average weight of brand A sample is 56 gr and brand B is 54 gr. The sample variances for A and B are 1 and 2 gr respectively. What will be the t-statistic and can we conclude that the weights of these brands are different at 0.05 significance level?

Which of the following test is used in case of more than two means of population?

In order to use Z test statistic for difference between two means, what is the minimum required sample size?

A researcher wants to test whether the average exam scores of two student groups (X and Y respectively) are same or not. How will he/she formulate null hypothesis (H₀) and alternative hypothesis (H₁)?

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?

In which statistical method, we might write down the following hypothesis:

"Is there any difference for the mean number of defective products which are manufactured by two different machine operators?"

I. Rejecting the null hypothesis in an ANOVA test means at least one of the means of the
population under consideration is different from the other population means. 

II. To compare two means through hypothesis testing procedure which is called one-way analysis of variance (one-way ANOVA) technique used to compare the means of two populations. 

III.  Rejecting the alternative hypothesis in an ANOVA test means at least one of the means of the population under consideration is different from the other population means. 

Which of the given statements about ANOVA test can said to be true?

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?

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

The observed z value is 3.62 and theoretical z value is 1.96, then what is the conclusion for hypothesis testing?

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?

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)

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

If for 5 population groups their sum of squares between is equal to 48 and the sum of squares within is equal to 19. The total sample size of the groups is equal to 100, then what is the F test statistics?

Which one of the following is an example of null hypothesis for testing the means of two normal distribution?

In an analysis of variance problem, if variance between samples is 45 and variance within samples is 125 then what is the F statistic?

For the variance between samples equalling 10 and the variance within samples equaling 20, what is the test statistic for a one-way ANOVA test is the ratio of two variances?