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(c) Carry out your test to determine if the two variables are correlated. 3. A new drug is being developed to lower cholesterol in patients with high levels of cholesterol. A trial has been set up to test its efficacy with 10 subjects. For each subject, their cholesterol level will be measured; they then take the drug for one year, after which their cholesterol level is measured again. These levels before and after the programme are denoted as Xi and Yi respectively. Let Di be the difference Di = Yi - Xi. The following information is available from the trial: ?Di = -31.71 and ?Di² = 120.358. Answer the following four question parts. (a) Write down a suitable investigative hypothesis for this research. From this, set out the Null and Alternate Hypothesis and the other elements of a suitable statistical test for this investigation. (b) Carry out this test using the data given. (c) Redo the test if the manufacturer of the drug now claims it will lead to a reduction of at least 2 units. (d) State the best method to explain what the data is showing about the effect of the drug.

          (c) Carry out your test to determine if the two variables are correlated.
3. A new drug is being developed to lower cholesterol in patients with high levels of cholesterol. A trial has been set up to test its efficacy with 10 subjects. For each subject, their cholesterol level will be measured; they then take the drug for one year, after which their cholesterol level is measured again. These levels before and after the programme are denoted as Xi and Yi respectively. Let Di be the difference Di = Yi - Xi. The following information is available from the trial:
?Di = -31.71 and ?Di² = 120.358.
Answer the following four question parts.
(a) Write down a suitable investigative hypothesis for this research. From this, set out the Null and Alternate Hypothesis and the other elements of a suitable statistical test for this investigation.
(b) Carry out this test using the data given.
(c) Redo the test if the manufacturer of the drug now claims it will lead to a reduction of at least 2 units.
(d) State the best method to explain what the data is showing about the effect of the drug.

(c) Carry out your test to determine if the two variables are correlated.
3. A new drug is being developed to lower cholesterol in patients with high levels of cholesterol. A trial has been set up to test its efficacy with 10 subjects. For each subject, their cholesterol level will be measured; they then take the drug for one year, after which their cholesterol level is measured again. These levels before and after the programme are denoted as Xi and Yi respectively. Let Di be the difference Di = Yi - Xi. The following information is available from the trial:
?Di = -31.71 and ?Di² = 120.358.
Answer the following four question parts.
(a) Write down a suitable investigative hypothesis for this research. From this, set out the Null and Alternate Hypothesis and the other elements of a suitable statistical test for this investigation.
(b) Carry out this test using the data given.
(c) Redo the test if the manufacturer of the drug now claims it will lead to a reduction of at least 2 units.
(d) State the best method to explain what the data is showing about the effect of the drug.

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