Cholesterol level data (in mg/dL) were collected on patients four days after having a heart attack. The data are in the table below. Determine if the data are from a population that is normally distributed.

142 160 186 206 210 220 224 226 234 244 266 270 272 276 278 280 282 310 318 360

a) Identify the individual, variable, type of variable and the random variable X in the context of this problem.

The individual isSelect an answer

20 randomly selected patients four days after having a heart attack

the cholesterol level

the mean cholesterol level of 20 randomly selected patients four days after having a heart attack

all patients four days after having a heart attack

a randomly selected patient four days after having a heart attack

the mean cholesterol level of all patients four days after having a heart attack

The variable information collected from each individual isSelect an answer

the mean cholesterol level of 20 randomly selected patients four days after having a heart attack

a randomly selected patient four days after having a heart attack

the cholesterol level

the mean cholesterol level of all patients four days after having a heart attack

20 randomly selected patients four days after having a heart attack

all patients four days after having a heart attack

This variable is aSelect an answer

qualitative -- discrete

quantitative -- continuous

qualitative

variable.

The random variable X is as follows:

Select an answer

rv X = the cholesterol level of a randomly selected patient four days after having a heart attack

rv X = all patients four days after having a heart attack

rv X = cholesterol level is normally distributed

rv X = the mean cholesterol level of all patients four days after having a heart attack

rv X = the mean cholesterol level of 20 randomly selected patients four days after having a heart attack

rv X = a randomly selected patient four days after having a heart attack

Normal Probability Plot

Does this graph support the claim that the sample data came from a normal population?

Select an answer

Yes, since the normal probability plot (QQ plot) is roughly linear

Yes, since the normal probability plot (QQ plot) is roughly bell-shaped

Yes, since the normal probability plot (QQ plot) is not roughly linear

Yes, since the normal probability plot (QQ plot) is not roughly bell-shaped

No, since the normal probability plot (QQ plot) is roughly linear

No, since the normal probability plot (QQ plot) is roughly bell-shaped

No, since the normal probability plot (QQ plot) is not roughly linear

No, since the normal probability plot (QQ plot) is not roughly bell-shaped

Does this graph support the claim that the sample data came from a normal population?

Select an answer

Yes, since the modified boxplot shows no outliers.

Yes, since the modified boxplot shows outliers.

No, since the modified boxplot shows no outliers.

No, since the modified boxplot shows outliers.

d)Final conclusion:

• It is reasonable to assume the sample data has a normal distribution
• It is not reasonable to assume that the sample data came from a normal population
• It is not reasonable to assume the sample data has a normal distribution
• It is reasonable to assume that the sample data came from a normal population