sample test

The mean score on a standardized test is 100 with a standard deviation of 8. A random sample of 48 scores was found to have a mean of 98. Test at the 0.05 level of confidence and state whether or not to accept the null hypothesis. => The null hypothesis is accepted or ..

A coin is tossed. Write the sample space. => {T} or {H, T} or { } or {H}..

The mean score on a standardized test is 100 with a standard deviation of 8. A random sample of 48 scores was found to have a mean of 98. Find the standard error. => 1.15 or 0.8 or 8.0 or 1.0..

The mean score on a standardized test is 100 with a standard deviation of 8. A random sample of 48 scores was found to have a mean of 98. State the null hypothesis and alternative hypothesis. => H o : The mean score = 100, H a : The mean score ≠ 100 or H o : The mean score = ..

In a study of reaction time to a medicine tested on a sample of 5 patients, an oncologist recorded the reaction times (in minutes) as 12, 20, 15, 28 and 30. Estimate the mean reaction time to the medicine with 95% confidence. => 11.2 < μ < 30.8 or 12 < μ < 30 o..

A school teacher estimated that 80% of the students can score grade A in the final test. He selected a random sample of 140 students after the final examination and observed that 115 students scored grade A. At α = 0.01, find the test value and comment on the tea..

If the degrees of freedom of the numerator is 15 and that of the denominator is 24 for testing the variances of two populations using F-test, then find the test value and the critical value at 95% confidence. The sample variances are 45 and 78. => 2.65, 1.83 ..

Three coins are tossed. Write the number of elements in the sample space. => 4 or 6 or 2 or 8..

Check whether the population variances differ significantly at 90% confidence. Also find out F-test value. The data relating to two samples from those populations are shown in the table. Sample size Sample variance 25 7 16 5.6 => 2.11, do not differ or 2.29, ..

What would be the sampling interval, if a systematic sample of 500 students has to be carried out in a university with an enrolled population of 10,000? => 50 or 20 or 1000 or 500..