Based on data collected by the National Center for Health Statistics and made available to the public
in the Sample Adult database (A-5), an estimate of the percentage of adults who have at some point in
their life been told they have hypertension is 23.53 percent. If we select a simple random sample of 20
U.S. adults and assume that the probability that each has been told that he or she has hypertension is
.24.
How many adults who have been told that they have hypertension would you
expect to find in a sample of 20?
.24 * 20 = ?
To calculate the expected number of adults who have been told they have hypertension in a sample of 20, you can multiply the sample size (20) by the probability (.24):
Expected number = Sample size * Probability
Expected number = 20 * 0.24
Expected number = 4.8
Therefore, you would expect to find approximately 4.8 adults who have been told they have hypertension in a sample of 20. Since you cannot have a fraction of a person, you can round this number to the nearest whole number. In this case, you would expect around 5 adults who have been told they have hypertension in the sample.
To find the number of adults who have been told that they have hypertension expected in a sample of 20, you can multiply the sample size (20) by the probability that each individual has been told they have hypertension (.24).
Expected number of adults with hypertension in the sample = Sample size x Probability
Expected number of adults with hypertension = 20 x 0.24
Expected number of adults with hypertension = 4.8
Since you cannot have a fraction of a person, you would expect to find approximately 5 adults who have been told they have hypertension in a sample of 20.