Question

Activity 1: A researcher wanted to examine the effectiveness of Vitamin C on the number of colds a year. The researcher obtained a sample of adults and asked to take Vitamin C daily. The average number of colds a year among adults is known to have the average of μ = 3. On the basis of this sample, can the researcher conclude that Vitamin C has an effect on the number of colds a year? Conduct a two-tailed test with alpha = .05.

Colds 2 2 2 1 3 3 1 2

Q1: State your Null and research hypotheses.

Q2: What is the df?

Q3: What are the cut-off points?

: What is the standard deviation?

Q5: What is the estimated standard error?

: What is the t-value?

Q7: State your conclusion thoroughly.

Answer 1

.....................................................................

critical value()=(-2.36, 2.36)

........................................................................................

7.)

Here t-value (-3.74) is in the critical region, hence Reject Null Hypothesis.

There is enough evidence to support the claim that the Vitamin C has an effect on the number of colds a year.