Estimate the mean total cholesterol level

Reference no: EM132673282

PROBLEMS

Question 1: A study is run to estimate the mean total cholesterol level in children 2 to 6 years of age. A sample of nine participants is selected and their total cholesterol levels are measured as follows:
185 225 240 196 175 180 194 147 223

Generate a 95% CI for the true mean total cholesterol levels in children.

Question 2: A clinical trial is planned to compare an experimental medication designed to lower blood pressure to a placebo. Before starting the trial, a pilot study is conducted involving ten participants. The objective of the study is to assess how systolic blood pressure changes over time untreated. Systolic blood pres¬sures are measured at baseline and again 4 weeks later. Compute a 95% CI for the difference in blood pressures over 4 weeks.
Baseline: 120 145 130 160 152 143 126 121 115 135
4 Weeks: 122 142 135 158 155 140 130 120 124 130

Question 3: The following data are collected as part of a study of coffee consumption among undergraduate students.

The following values reflect cups per day consumed.
3 4 6 8 2 1 0
a. Compute the sample mean.
b. Compute the sample standard deviation.
c. Construct a 95% CI for the mean number of cups of coffee consumed among all undergraduates.

Question 4: Table 6-26 displays descriptive statistics on the par-ticipants involved in the study described in Problem 7.
a. Generate a 95% CI for the mean age among par-ticipants assigned to the placebo.
b. Generate a 95% CI for the difference in mean ages in participants assigned to the experimental ver¬sus the placebo groups.
c. Generate a 95% CI for the difference in mean BMI in participants assigned to the experimental ver¬sus the placebo groups.

Question 5: A 95% confidence interval for the mean diastolic blood pressure in women is 62 to 110. What is the margin of error? What is the standard error?

Question 6: The following data are collected from 10 randomly selected patients undergoing physical therapy fol-lowing knee surgery. The data represent the percent-age gain in range of motion after 3 weeks of therapy. Generate a 95% confidence interval for the mean percentage gain in range of motion.
24% 32% 50% 62% 21%
45% 80% 24% 30% 10%

Attachment:- biostatistics.rar

Reference no: EM132673282

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