9.2 D1 CYU

9.2 D1 CYU

Check your understanding problem

Sharon claims that 90% of students can identify the smell of a skunk. She selects a random sample of 100 students and asks them each to take a whiff from a bag filled with skunk smell. She finds that 84 are able to correctly identify the smell as that of a skunk. She would like to know if these data provide convincing evidence that less than 90% of students can identify the smell of a skunk. Use alpha=0.05.

Open Ended

Sharon claims that 90% of students can identify the smell of a skunk.

Define the parameter of interest using correct notation.

Open Ended

Sharon claims that 90% of students can identify the smell of a skunk.

State appropriate hypotheses for performing the signficance test.

Open Ended

She conducts a study from a random sample of 100 students and finds 84 are able to correctly identify the smell. Explain why the sample result gives some evidence for the alternate hypothesis.

Open Ended

Show the three conditions for performing the significance test are met.

Fill in the Blanks

Calculate the standardized test statistic.

Fill in the Blanks

Calculate the p-value and enter to 4 decimal places. (i.e. 0.1234)

Multiple Choice

What conclusion should Sharon make?

• Since p-value is < .05, reject Ho. There is evidence for Ha.

• Since p-value is < .05, fail to reject Ho. There is not evidence for Ha.

• Since p-value is < 0.5, reject Ho. There is not evidence for Ha.

• Since p-value is < .05, fail to reject Ho. There is evidence for Ha.