sample of math test

A survey suggests that 90% of the chief executives of the largest companies in the United States are of above average height. From a random sample of 140 executives it was observed that 119 are of above average height. Find the p -value for the test. Is there enough evidence to ..

Which of the following is a property of sampling distribution? I. Mean of sampling distribution equals population mean. II. Sample mean comes closer to population mean than any other unbiased mean. III. As sample size increases, variation of sample ..

In the F test to compare means if the number of groups is k and the sum of sample sizes of the group is N , then what is the degrees of freedom? => d.f. N = N - k and d.f. D = k - 1. or d.f. N = k and d.f. D = i N - k . or d.f. N = k - 1 and d.f. D = N + k . or d.f. N = k - 1, d..

A physical education teacher reported that the mean height of all the girls of grade 10 was 164.5 cm. From a random sample of 20 girls selected from a school, it was observed that the mean height was 167.5 cm and the standard deviation was 6 cm. Test the teacher's report at &alp..

A civil engineer in U.S. earns an average annual salary of $40,280 as reported in an economic survey. The mean salary of a sample of 20 civil engineers was found to be $40,000 with a standard deviation of $353. At α = 0.05, what is the test value? Is the survey report true..

A four year public college or university charged a tuition fees of $10,903 in the year 2000, on an average. In 2001, a random sample of 10 four year public colleges or universities had a mean of $11,418 with a standard deviation of $650. At α = 0.01, find the test value an..

The manager of a company estimated that the average typing speed of the data entry operators is above 60 words per minute with a standard deviation of 3.6 words per minute. Average typing speed of a sample of 40 operators was observed as 61.5 words per minute. Find p -value for the t..

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 ..

A school teacher estimated that the average score of the students in a math quiz is less than 20. A sample of 30 students is selected for the math quiz and their scores are as shown. Find the p -value for the test. Is there enough evidence to support the teac..

A manufacturer claims that the mean content of soft drink in bottles is 300 ml. The contents vary normally with standard deviation σ = 4 ml. A sample of 40 bottles are randomly selected and tested. A 5% significance test rejects H 0 if z ≤ - 1.65, where z is t..