Which measure of central tendency is more representative of the typical observation if the graph of the data is skewed to the right?
A) Midrange B) Mode C) Mean D) Median
Q. 2A statistics student interviews everyone in his apartment building to determine who owns a cell phone. What sampling technique is used?
A) systematic
B) simple random
C) cluster
D) convenience
E) stratified
Q. 3The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 400 hours and a standard deviation of 9 hours. What percentage of the bulbs have lifetimes that lie within 1 standard deviation to either side of the mean?
A) 68.26 B) 31.74 C) 95.44 D) 84.13
Q. 4The serum cholesterol levels for men in one age group are normally distributed with a mean of 178.3 and a standard deviation of 40.6. All units are in mg/100 mL. Find the 9th percentile.
A) 123.9 mg/100mL B) 107.7 mg/100mL C) 161.7 mg/100mL D) 165.3 mg/100mL
Q. 5Suppose a brewery has a filling machine that fills 12-ounce bottles of beer. It is known that the amount of beer poured by this filling machine follows a normal distribution with a mean of 12.26 ounces and a standard deviation of 0.04 ounce.
The company is interested in reducing the amount of extra beer that is poured into the 12 ounce bottles. The company is seeking to identify the highest 1.5 of the fill amounts poured by this machine. For what fill amount are they searching? Round to the nearest thousandth.
A) 12.173 oz B) 11.913 oz C) 12.347 oz D) 12.087 oz
Q. 6A travel industry researcher interviews all of the passengers on five randomly selected cruises. What sampling technique is used?
A) cluster
B) systematic
C) convenience
D) simple random
E) stratified
Q. 7The amount of corn chips dispensed into a 32-ounce bag by the dispensing machine has been identified as possessing a normal distribution with a mean of 32.5 ounces and a standard deviation of 0.2 ounce.
What chip amount represents the 67th percentile for the bag weight distribution? Round to the nearest hundredth.
A) 32.13 oz B) 32.63 oz C) 32.59 oz D) 32.09 oz
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