Statistics 4th Quarter Long Quiz (Part 1)

Which of the following statement describes a parameter.

• The average income of 40 out of 100 households in a certain Barangay is P 12, 213.00 a month.

• Percentage of red cars in the Philippines.

• A recent survey of a sample of 250 high school students reported the average weight of 54.3 kg.

• None of the above.

Answer explanation

A parameter is a descriptive population measure. It is a measure of the characteristics of the entire population. The percentage of red cars in the Philippines talks about ALL the red cars in the country.

All of the statements below are true, EXCEPT for:

• A statistic is a number which describes a sample.

• A parameter is a descriptive measure of population.

• An example of parameter is the sample mean.

• An example of parameter is a population mean

Answer explanation

Sample mean is an example of a statistic. Statistic is the number that describes the sample.

A ____ is a frequency distribution using the means computed from all possible random samples of a specific size taken from a population.

• Sample distribution of sample mean

• Frequency Distribution Table

• Z-table

• T-table

When is a Type II error committed?

• We reject a null hypothesis that is true.

• We reject a null hypothesis that is false.

• We fail to reject a null hypothesis that is true.

• We fail to reject a null hypothesis that is false.

Answer explanation

A Type II Error is committed when you accept a null hypothesis that is false.

The null hypothesis is an initial claim which the researcher tries to ____.

• reject

• accept

• fail to reject

• change

Answer explanation

The null hypothesis is an initial claim based on previous analyses, which the researcher tries to reject.

"Fail to reject" means to accept

Find the confidence interval with upper confidence limit of = 0.632 and Lower confidence limit = 0.475

• 0.157

• 1.703

• 0.10

• 1.383

Answer explanation

To get the length of confidence interval, simply subtract the upper confidence limit to the lower confidence limit.

Find the confidence interval with lower confidence limit of = 0.0254 and upper confidence limit = 0.560

• 0.157

• 0.5346

• 0.486

• 0.2863

Answer explanation

To get the length of confidence interval, simply subtract the upper confidence limit to the lower confidence limit.

The level of significance is denoted by ____.

• alpha or α

• beta or β

• myu or μ

• sigma or σ

The alternative hypothesis is contrary to the ______.

• Hypothesis testing

• Hypothesis

• Null Hypothesis

• Alternative Hypothesis

Answer explanation

The alternative hypothesis is opposite to the null hypothesis, which shows that there is significant difference or relationship between a parameter and specific value.

Which of the following is a keyword used in an Alternative Hypothesis?

• equal to

• not equal

• the same as

• is

Answer explanation

All the other keywords are the keywords to null hypothesis.