T-tests, ANOVA and p-values

A student wants to test if the time taken for amylase to digest all the starch in a sample was faster with copper sulfate than without it. She did 10 repeats for each group. To analyse the data she should...

• Use a paired T-test

• Use an unpaired T-test

• Use an ANOVA

• Draw a scatter graph and look for correlation

A student tests the reaction times of the same 20 students before or after drinking coffee. How should she analyse the data to see if coffee has had an effect?

• Use a paired T-test

• Use an unpaired T-test

• Use an ANOVA

• Draw a scatter graph and look for correlation

A student wants to test whether 3 activities (treadmill, cross trainer or rowing machine) have significantly different effects on the heart rate. How should they test the data?

• Use a paired T-test

• Use an unpaired T-test

• Use an ANOVA

• Draw a scatter graph and look for correlation

A student wants to test whether cats are more intelligent than dogs. How should he analyse his data?

• Use a paired T-test

• Use an unpaired T-test

• Use an ANOVA

• Draw a scatter graph and look for correlation

A student wants to know if taller people have bigger feet. They collect the height and shoe size of 200 people. How should they analyse the data?

• Use a paired T-test

• Use an unpaired T-test

• Use an ANOVA

• Draw a scatter graph and look for correlation

Tags

NGSS.HS-LS3-3

A student wants to know if the water lost by plants in transpiration is significantly different in 4 different environmental conditions. 20 plants were left in each of the 4 conditions and the water loss measured after 2 days. How should this data be analysed?

• Use a paired T-test

• Use an unpaired T-test

• Use an ANOVA

• Draw a scatter graph and look for correlation

Tags

NGSS.HS-LS1-3

A T-test is used to test for a difference in weight between mice fed on 2 different diets. The p-value calculated is 0.3, this means that:

• The null hypothesis should be accepted as p is greater than 0.05 : there is no significant difference between groups,

• The null hypothesis should be rejected as p is greater than 0.05 : there is a significant difference between groups

• There is a clear correlation between the diet and the size

• The alternative hypothesis should be accepted as p is less than 5%

Tags

NGSS.HS-LS3-3

A T-test was used to test for a difference in blood pressure before and after drinking chicha morada. The p-value calculated is 0.01, this means that:

• The null hypothesis should be accepted as p is greater than 0.05 : there is no significant difference between groups,

• The null hypothesis should be rejected as p is less than 0.05 : there is a significant difference between groups

• There is a clear correlation between the diet and the size

• The alternative hypothesis should be rejected as p is less than 5%

A T-test was performed on some data. The p-value was 0.5 . The investigators should:

• Accept the null hypothesis

• Reject the null hypothesis

• Not enough information to say

Which of these could be a null hypothesis for a T-test?

• One of the groups will have a higher mean than the other.

• The means of the groups are different but we do not know which will be bigger

• There is no significant difference between the means of the groups

• Any of the above could be the null hypothesis