Ünite Sınavı Soruları

In two population hypothesis testing which of the following is true?

I. If the alternative hypothesis is in the form of H₁: p1α

II. If the alternative hypothesis is in the form of H₁: p1>p2 then rejection region is z>z_α

II. If the alternative hypothesis is in the form of H₁: p1≠p2 then rejection region is z=z_α/2 

For the given statements about  the hypothesis test of the difference between two population proportions which ones can be said to be true?

A scientist found the following statistics for a hypothesis testing of two population proportions:

Population 1 : x1=12, n1=60

Population 2 : x2=30, n2= 90

What is the observed t value in this problem? 

In order to compare more than two means, which of the following statistical analysis can be carried out?

The population variances for two samples are 2 and 5, the difference of the sample means for these two samples is 3, and the sample sizes are 100 and 500, respectively. For the given values what is the test statistic?

What is the shaded region indicated by arrows called in hypothesis testing?

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?

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)?

Which of the following statements is false regarding the test statistic formula below, which is for two sample tests of means when their population variances are known?

Which of the given forms of hypothesis equivalently is one that is correct?

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

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?

What is the rejection region if the alternative hypothesis is in the form of H1 : µ1 < µ2 ?

Which of the following is the null hypothesis for the right sided (upper tailed) test ?

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?

Which test statistic do we use when the population variances are unkonwn and the sample size is smaller than 30?

In a two population proportion problem x1 =50; n1=200; x2=120; n2 =400 then what is the value of joint p value?

What is the critical z-value for α=0.05?

For Group 1 and Group 2 data that are normally distributed, and the population variances are not equal, we can we conclude that there is a the mean of Group 1 is greater than the mean of Group 2. What is the alternative hypothesis?