Compute the sample standard deviation

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Reference no: EM132650524

Question 1: The following data were collected as part of a study of coffee consumption among graduate students.

The following reflect cups per day consumed:
3 4 6 8 2 1 0 2

a. Compute the sample mean.
b. Compute the sample standard deviation.
c. Compute the median.
d. Compute the first and third quartiles.
e. Which measure, the mean or median, is a better measure of a typical value? Justify.
f. Which measure, the standard deviation or the interquartile range, is a better measure of disper-sion? Justify.

Question 2: In a study of a new anti-hypertensive medication, systolic blood pressures are measured at baseline. The data are as follows:
120 112 138 145 135
150 145 163 148 128
143 156 160 142 150

a. Compute the sample mean.
b. Compute the sample median.
c. Compute the sample standard deviation.
d. Compute the sample range.
e. Are there any outliers? Justify.

Question 3:

Figure 4-26 shows birth weight (in grams) of in-fants who were delivered full-term, classified by their mother's weight gain during pregnancy:
a. What is the median birth weight for mothers who gained 50 to 74 pounds?
b. What is the interquartile range for mothers who gained 75 pounds or more?
c. Are there any outliers in birth weight among mothers who gained less than 50 pounds?
d. What are the best measures of a typical birth weight and the variability in birth weight among mothers who gained less than 50 pounds?

Question 4: A pilot study is run to investigate the feasibility of recruiting pregnant women into a study of risk fac-tors for preterm delivery. Women are invited to participate at their first clinical visit for prenatal care. The following represent the gestational ages in weeks of women who consent to participate in the study.
11 14 21 22 9 10 13 18
a. Compute the sample mean gestational age.
b. Compute the sample standard deviation of gesta-tional age.
c. Compute the median gestational age.
d. What proportion of the sample enroll in the first trimester of pregnancy (i.e., between 1 week and 13 weeks, inclusive, of pregnancy)?

Question 5: If there are outliers in a sample, which of the follow¬ing is always true?
a. Mean > Median
b. Standard deviation is smaller than expected (smaller than if there were no outliers)
c. Mean < Median
d. Standard deviation is larger than expected (larger than if there were no outliers)

Attachment:- bio_State.rar

Reference no: EM132650524

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