Chi squared test and t test

Chi squared test and t test

Multiple Choice

Python eggs How is the hatching of water python eggs influenced by the temperature of the snake’s nest? Researchers randomly assigned newly laid eggs to one of three water temperatures: hot, neutral, or cold. Hot duplicates the extra warmth provided by the mother python, and cold duplicates the absence of the mother. Here are the data on the number of eggs that hatched and didn’t hatch.

If the p-value is .08 and you use .05 as your alpha, what is your conclusion

• Fail to reject: We do not have sufficient evidence that distribution of hatched is different for water temperature options

• Reject: We do not have sufficient evidence that distribution of hatched is different for water temperature options

• Fail to reject: We do have sufficient evidence that distribution of hatched is different for water temperature options

Multiple Choice

How do you find degrees of freedom for a chi-square goodness of fit test?

• one less than the sample size

• one less than the population

• total number divided 2

• total number times 2

Multiple Choice

The shape of the Chi-Square distribution is ___.

• Left Skewed

• Right Skewed

• Unimodal & Symmetric

• Bimodal & Symmetric

Multiple Choice

What must be true about the expected values in a chi square test?

• greater than or equal to 2
• greater than or equal to 5
• greater than or equal to 10
• greater than or equal to 30

Multiple Choice

The table shows the number or babies born on each day of the week.  Is there evidence that births are more likely on specific days of the week?

• yes, the p value is greater than .05
• no evidence, the p value is less than .05
• yes, the p value is less than .05
• no evidence, the p value is greater than .05

Multiple Choice

The table shows the number or babies born on each day of the week.  Is there evidence that births are more likely on specific days of the week?

• yes, the p value is greater than .05
• no evidence, the p value is less than .05
• yes, the p value is less than .05
• no evidence, the p value is greater than .05

Multiple Choice

What statistical model does this graph illustrate?

• normal model
• t model
• chi square model

Multiple Choice

What is the expected value for all cells, if we assume that this is a fair six sided die?

• 96
• 16
• 8
• 1/6

Multiple Choice

What is the expected value for all cells, if we assume that this is a fair six sided die?

• 96
• 16
• 8
• 1/6

Multiple Choice

The bigger the chi square statistic, the ________ the p value.

• bigger
• smaller

Multiple Choice

How many degrees of freedom will be present?

• 4

• 5

• 6

• 7

Multiple Choice

Which of the following is false?

• A chi-squared distribution with k degrees of freedom is more right-skewed than a chi-square distribution with k+1 degrees of freedom.
• A chi-square distribution never takes negative values.
• The degrees of freedom for chi-square test is determined by sample size.
• The area under a chi-square density curve is always equal to 1.