WS5 group 1

What is an independent sample t-test used for?

• Comparing means from a sample and a population

• Comparing means from more than two samples

• Comparing means from two related samples

• Comparing means from two independent samples

The weight of the average 6th grade student's backpack (with books in it) is 4 kilograms. The principal of the school thinks that the backpack does not weight 4 kilograms. What is the null and alternate hypothesis? 

• H₀ = 4

  H_a = 4

• H₀ = 4

  H_a > 4

• H₀ =4

  H_a < 4

• H₀ = 4

  H_a ≠ 4

A survey of 600 people was conducted to find out if the type of television show that a person chooses to watch is related to the brand of deodorant that the person uses. Which test would be ideal to answer this question?

• Chi-Square Test for Independence

• ANOVA

• Independent sample t test

• Paired sample t test

In an experiment to test if teaching mathematics early morning is associated with better SAT scores, a researcher conducts a survey on 6000 students and arrives a p value of 0.13. At a 5% level of significance, what would be the most suitable conclusion from the study?

• The researcher can assume that teaching maths early morning has no effect in the SAT scores of students.

• The researcher can assume that teaching maths early morning has no effect in the SAT scores of students for her sample only.

• The researcher can assume that teaching maths early morning has an effect in the SAT scores of students.

• The researcher can assume that teaching maths early morning has an effect in the SAT scores of students for her sample only.

In an experiment to test if teaching mathematics early morning is associated with better SAT scores, a researcher conducts a survey on 6000 students and arrives a p value of 0.13. At a 5% level of significance, what would be her decision?

• She has sufficient evidence to reject the null hypothesis.

• She has insufficient evidence to reject the null hypothesis. 

• She has sufficient evidence to reject the alternative hypothesis. 

• She has insufficient evidence to reject the alternative hypothesis. 

ANOVA is used to compare the differences in _________ for more than 2 populations

• Means

• Variances

• Correlation coefficients