a. Independent group means, population std deviatiions and/or variances known b.

Question

a. Independent group means, population std deviatiions and/or variances known

b. independent group means, population std deviations and/or variances unknown

c. matched or paired samples

d. single mean

e. 2 proportions

f. single proportion

which of the following choices best identifies the hypothesis test for:

1. A new chocolate bar is taste-tested on consumers. Of interest is whether the proportion of children that like the new bar is greater than the proportion of adults that like it.

2. a football league reported that the mean number of touchdowns per game was 5. A study is done to determine if the mean number of touchdowns has decreased.  

3. According to a YWCa Rape Crisis center newsletter, 75% of rape victims know their attackers A studey is done to vertify this

4. A new SAT study course is tested on 12 individuals. Pre-course and post-course scores are recoreded. Of interest is the mean increase in SAT scores.  

Explanation / Answer

1. A new chocolate bar is taste-tested on consumers. Of interest is whether the proportion of children that like the new bar is greater than the proportion of adults that like it.

Since we are looking for difference between two proportions, use 2 proportions.

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2. a football league reported that the mean number of touchdowns per game was 5. A study is done to determine if the mean number of touchdowns has decreased.  

Since we want to compare (one) sample mean with population mean, use single mean.

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3. According to a YWCa Rape Crisis center newsletter, 75% of rape victims know their attackers A studey is done to vertify this.

Since we want to compare (one) sample proportion with population proportion, use single proportion.

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4. A new SAT study course is tested on 12 individuals. Pre-course and post-course scores are recoreded. Of interest is the mean increase in SAT scores.

Since same subjects are measured twice, samples are paired (matched), use matched or paired samples.

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