1.What is the t-value of a one-tailed t-distribution with ∝ =2.5% ??? df=22?
1.What is the t-value of a one-tailed t-distribution with ∝ =2.5% ??? df=22?
2. What is the population mean of the given set of data?
{3, 5, 9, 7, 10}
3.In a random sample of 100 people in a town, the average amount of garbage
generated by each person per day is 500 grams. Construct a 99% confidence
interval for the population mean if the population standard deviation is 250 grams.
4.A sample of size 3 is taken from a population of the number of students in each
class of Grade 9 students listed as 25, 30, 35, and 40. Compute for the mean of the sampling distribution of the sample means.
5.Determine the point estimate of the population mean.
{23, 34, 22, 26, 25}
6.What is the size of the population from the given set of data?
{2, 5, 8, 3, 7}
7.Suppose that a population of 6 numbers (18, 20, 22, 29, 30, 32) is to be tested and
a sample size of 4 is extracted. Compute for the variance of the sampling distribution of the sample mean.
8.In a ?-distribution, what is the area under the curve that is to the right of ?=1.337 and with ??=16?
9.What is the degrees of freedom of a sample of 28?
10.What is the degrees of freedom of a sample of 11?
11.what is the probability that the sample
mean is 30?
| sample mean | probability |
| 15 | 1/6 |
| 20 | 1/6 |
| 25 | 1/3 |
| 30 | 1/6 |
| 35 | 1/6 |
12.In a ?-distribution, what is the area under the curve that is to the right of ?=2.492 and with ??=24?
13.What is the t-value of a two-tailed t-distribution with ∝ =40% ??? n=16?
14.Two sample sizes were taken for a research study: 26 for the experimental group and 20 for the control group. If ?-distribution is to be used, what degrees of freedom should be used by the researcher?
15.From the given table below, what is the probability that the sample
mean is less than 25?
| sample mean | probability |
| 15 | 1/6 |
| 20 | 1/6 |
| 25 | 1/3 |
| 30 | 1/6 |
| 35 | 1/6 |
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