random samples

Which of the following are the assumptions for two-way ANOVA? I. All samples are drawn from normally distributed populations. II. All populations have a common variance. III. The groups must be equal in sample size. IV. Within each group, the observations were sampled ..

A company makes wooden wardrobes having a standard height of 55 in., with a standard deviation of 2.5 in. In a random sample of 23 wardrobes, 6 wardrobes measured 58.5 in., 8 wardrobes measured 53.8 in. and 9 wardrobes measured 56 in.. Approximate the standard error. => 4.79 or ..

A company makes wooden wardrobes having a standard height of 55 in., with a standard deviation of 2.5 in. In a random sample of 23 wardrobes, 6 wardrobes measured 58.5 in., 8 wardrobes measured 53.8 in. and 9 wardrobes measured 56 in.. Test at 0.05 level of confidence and find o..

Past records indicated that pass percentage of the high school students in a school was 85%. New techniques are adopted for teaching and it was observed that 182 students passed out of a random sample of 200. At α = 0.01, is there enough evidence to support the claim that ..

A pizza shop conducted a study to find out whether age has anything to do with the type of pizza preferred. A random sample survey yielded the result as shown. At α = 0.05, find the chi-square test value. State whether the pizza ordered is related to the age of the person ..

A random sample of Sitka Spruce trees is selected from 3 different locations - Vancouver Island, California and Alaska. The heights of these trees are tabulated as shown. At α = 0.10, find the F test value and test the claim that the mean height of the trees are the same. ..

The mean number of candies in a packet is 175, with a standard deviation of 5 candies. A random sample of 70 packets from a certain shipment has a mean of 174.2 candies. Which of the following statements is true? 1.The null hypothesis is accepted. 2.Standard error = 1.78 3.The s..

A college administration reported that more than 60% of the student body is in favour of candidate John being elected as the student council officer. From a random sample of 100 students it was found that 62 voted in favour of John. Find the p -value. Is there enough evidence to..

A random sample for sale of Australian Herbal medicines (in million dollars) per year is shown. Estimate the mean sale of the medicines with 99% confidence level. 2.1, 2.8, 3.3, 3.6, 3.8, 4.1 => 2.98 < μ < 3.58 or 2.1 < μ < 4.1 or 3.28 < μ < 4.48 or 2...

In a report, the standard deviation of the weights of male student athletes is stated as 2 pounds. The standard deviation of weight of a random sample of 24 male student athletes was found as 1.9 pounds. Find the chi-square test value. At α = 0.01 is there enough evidence ..