sample test

A population consists of the five numbers 2, 4, 6, 8 and 10. Consider all the samples of size 2 that can be drawn with replacement from the population. Find the mean of the sampling distribution means. Also find the difference between the population mean and mean of the sam..

A pharmaceutical company distributed 12000 trial samples of an acne relief cream to middle school students. How many middle class students were there in the school, if each student received 4 samples? => 3100 or 3000 or 2700 or 3200..

In a survey it was found that 20% of people living in a society watch channel A. If a random sample of 10 people are selected, then find the probability that at most 3 people in the sample watch channel A. => 0.878 or 0.2 or 0.79 or 0.59..

In a survey it was found that 20% of people living in a society watch channel A. If a random sample of 120 people is selected, then find the standard deviation of the number of people in the sample who watch channel A. => 24 or 19.2 or 4.38 or 96..

In a NBA playoff season the average number of points scored in a game was 200. Assume the standard deviation was 75. If a random sample of 20 games is selected, then what is the probability that the mean of the sample is lesser than 220? => 17.20% or 33.80% or 67.20% or 88.30% o..

Determination of sample size depends on: I. sample variance II. population standard deviation III. degree of confidence IV. maximum error of estimate => II and III only or all of the above or II, III and IV only or I, III and IV only..

A population consists of the five numbers 1, 3, 5, 7 and 9. Consider all the samples of size 2 that can be drawn without replacement from the population. Find the mean and the variance of the sampling distribution means. => 6 and 4.05 or 6 and 3 or 5 and 3.05 or 5 and 3..

A manufacturer claims that the rods manufactured in their factory have a diameter of 8.5 cm. A random sample of 80 similar iron bars were tested and found that the mean diameter is 8.43 cm and the variance is 0.032 cm 2 . Is there enough evidence to conclude that the diameter of..

In a factory, 400 calculators were checked, out of which 40 were found to be defective. How many defective calculators can be found in a sample of 1200 calculators? => 110 or 120 or 130 or 90..

Five students from each class of the school were interviewed to find out their opinion on the transportation facilities. What is the type of sampling used? => cluster or stratified or systematic or random..