4) A researcher wants to find out if background noise affects typing speed. Two

Question

4) A researcher wants to find out if background noise affects typing speed. Two groups of student typists were selected and matched on the basis of typing speed, that is, number of error-free words per minute. One group is tested in total silence and the other group is tested under high noise. Test 5) A school psychologist compares the reading comprehension scores of migrant children who, as a result of random assignment, are enrolled in either a special bilingual reading program or a traditional reading program.

Explanation / Answer

4) Here we need to use two sample independent t test.

Because we have two groups and the sample information of speed of typing from each groups. Using this sample information we can test the equality of two population mean of speed of typing for these groups.

5) Here we need to used pair t test because experiment is on the same groups of groups of migrant children.

6) Here we can use t test for correlation. Because we need to test the correlation between the scores and depression.

7) Here we need to used chi square independent test for two attributes as IQ and foot size.

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