Formative 4.2: T-Distribution

A random sample of 24 data from a normal distribution produced an average of 42.5 and a deviation of 2.6. If the population average is 43.7, what is the degrees of freedom?

A random sample of 24 data from a normal distribution produced an average of 42.5 and a deviation of 2.6. If the population average is 43.7, what is the critical value?

A random sample of 24 data from a normal distribution produced an average of 42.5 and a deviation of 2.6. If the population average is 43.7, what is the value of the t-statistics? (Use three decimal place)

A random sample of 24 data from a normal distribution produced an average of 42.5 and a deviation of 2.6. If the population average is 43.7, is this how the graph should look like?

• Yes

• No

• Almost

A random sample of 24 data from a normal distribution produced an average of 42.5 and a deviation of 2.6. If the population average is 43.7, can the data represent the population?

• Yes

• No

• Almost

If a two-tailed graph of the distribution has a df = 28 and the non-shaded area is 90%, what is the value of the margin of error? (Use two decimal places)

If a two-tailed graph of the distribution has a df = 28 and the non shaded area is 90%, what does the positive critical value (+t) represent?

• 95th percentile

• 90th percentile

• 5th percentile

• 10th percentile

If a two-tailed graph of the distribution has a df = 28 and the non shaded area is 90%, what is the critical value? (Use four decimal places)