A survey designed to measure mothers’ attitudes towards their labor and delivery

Question

A survey designed to measure mothers’ attitudes towards their labor and delivery experiences was given to two groups of new mothers before being sent home from the hospital with their babies. Sample 1 (attendees) attended prenatal classes held at the local health department. Sample 2 (non-attendees) did not attend the classes. A higher survey score indicates a better attitude. Scores are assumed to follow a Normal distribution.

Sample 1: n = 19, mean = 5.5, standard deviation = 2.2

Sample 2: n = 23, mean = 4.9, standard deviation = 3.5

Which analysis should be done to assess the impact of prenatal classes on mothers’ attitudes? Please explain, thank you!

a.) Paired t-test

b.) Two independent sample t-test

c.) Chi-square test of independence

d.) None of the above

Explanation / Answer

The scores of 2 samples follow normal distribution. Normality assumption is satisfied.

The same set of participants are not used for 2 experiments. Meaning the two sample groups are independent. so we cannot use paired t-test

s1^2/s2^2 = 2.5. This ratio if it is greater than 3 or 4, signifies unequal variance. so we can say equal variances for these 2 samples. Equal variances assumption is satisfied.

We can use 2 independent sample t-test. Because the 2 samples

a) are normally distributed

b) not paired but independent

c) have equal variances.

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