Seçmeli Ara Sınav - Statıstıcs Iı

Soru 1:

Which of the following are among the reasons for sampling? Cost Time Accuracy Destructive tests Esthetics

A) II, III, IV and V B) I, III, IV and V C) I, II, IV and V D) I, II, III and IV E) I, II, III and V

Soru 2:

I. The mean, median and mode of the t distribution are all equal to zero. II. The t distribution is bell-shaped and symmetrical. The total area under a t-curve is 1 or 100% III. As the degrees of freedom decreases, the shape of the t-distribution approaches to the standard normal distribution. Which of the given statements about properties of the t-distribution are true?

A) Only I B) Only II C) I and II D) I and III E) II and III

Soru 3:

Which sign we are not going to use in one sample hypothesis problems for alternate hypothesis?

A) ≠ B) > C) > D) = E) >=

Soru 4:

In a university, a surveyor calculated the proportion of girls as 30 % and 34 % at ages 20 and 21, and proportion of boys are 26 % and 10 % of the boys at ages 20 and 21, respectively. What is the sampling method she used ?

A) convenience B) simple random C) snow ball D) quota E) multi stage

Soru 5:

A linguist interviews with speakers of a rare languge A. She selects a few speakerss to start with and at the end of interview he asks if the participant knows any other speakers that might want to participate. Which type of sampling method does the manager use?

A) convenience B) quota C) snow ball D) multi stage E) cluster

Soru 6:

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?

A) x1-x2is the difference of the sample mean B) The sampling distribution is standard normal distribution. C) σ21, σ22are known population variances D) When any of the sample size is larger than 30, then sample variances could be used instead of population variances. E) n1, n2are the sizes of the sample of the two independent populations

Soru 7:

A researcher wants to collect data about drug users and knows a few of them. The researcher asks identified subjects to recruit other members and this process is repeated until the determined sample size is achieved. This researcher uses _______.

A) Snowball sampling B) Systematic sampling C) Quota sampling D) Convenience sampling E) Cluster sampling

Soru 8:

Sample values for a continuous variable (noise level in a classroom ; as decibel) : 32, 38, 46, 48, 54, and 64. What is the point estimate of the population arithmetic mean?

A) 46 B) 47 C) 48 D) 49 E) 50

Soru 9:

Interval estimation : the limits of the confidence interval are (205, 245), the significance level is 0.05. What is the sample arithmetic mean?

A) 210 B) 215 C) 225 D) 235 E) 240

Soru 10:

Sample values for a continuous variable (weather temperature in a day ; as o C) : 10, 16, 20, and 28. What is the point estimate of the population arithmetic mean?

A) 18.0 B) 18.5 C) 19.0 D) 19.5 E) 20.0

Soru 11:

Which of the following problems requires a two-sided test?

A) Chinese men are taller than the Japanese man. B) Meditterian region olives contain more fat than Aegean region olives. C) There is no difference between the durations of batteries brand A and brand B. D) Mercedes cars are consume produce less carbon monoxit than BMW cars do. E) Cancer risk of men is more than that of women.

Soru 12:

Which one of the following is not a reason of sampling?

A) Cost B) Time C) Accuracy D) Inequality E) Physical impossibility

Soru 13:

In an investigation, if the significance level is 0.47, what is the confidence level in this study?

A) 0.47 B) 0.53 C) 0.05 D) -1 E) 0.1

Soru 14:

I. If the alternative hypothesis is in the form of H 1 : p1p2 then rejection region is z>z ? II. If the alternative hypothesis is in the form of H 1 : p1?p2 then rejection region is z=z ?/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) Only I B) Only II C) I and II D) I and III E) II and III

Soru 15:

Systematic sampling : sample size is 1024, number of members in the population is 16, random starting point is 257. Which one is the 3rd sample?

A) 225th B) 289th C) 514th D) 771th E) 787th

Soru 16:

In which reason of sampling we consider "Some populations are uncountable or infinite to conduct a census"?

A) Cost B) Accuracy C) Destructive tests D) Physical Impossibility E) Mean

Soru 17:

Which method's most important feature is efficiency?

A) Stratified sampling B) Snowball sampling C) Convenience sampling D) Quota sampling E) Cluster sampling

Soru 18:

For age variable the following sample data is gathered: 45, 47, 42, 40, and 51. What is the point estimate of the population arithmetic mean for variable age?

A) 45 B) 42 C) 40 D) 49 E) 57

Soru 19:

How many different subgroups of 5 members can be obtained from a population of 8 members?

A) 15 B) 35 C) 42 D) 56 E) 336

Soru 20:

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?

A) 30 B) 40 C) 50 D) 60 E) 70