1.1 - 1.3 Quiz

For all the students in a high school, the mean grade point average is 2.95. Is the mean grade point average a parameter or a statistic?

​ (a)  

• Parameter
• Statistic

The principal asks 50 randomly selected students whether the student parking lot should be expanded. Identify the method of data collection.

​ (a)  

• Survey
• Experiment
• Observational Study
• Simulation

A normal distribution has a mean of 72 and a standard deviation of 5. Find the probability that a randomly selected x​ -value from the distribution is between 67 and 77. Round your answer to the nearest hundredth.

The probability is about__ .

Mathematical Equivalence

ON

A normal distribution has a mean of 72 and a standard deviation of 5. Find the probability that a randomly selected x-value from the distribution is less than 75. Round your answer to the nearest ten thousandth.

The probability is about ​ ​ (a)   .

• 0.7257
• 0.2743
• 0.6179
• 0.3228

In a survey, 1600 randomly selected U.S. adults are asked whether they have purchased a product online. The results are shown in the circle graph.

Identify the Population and Sample

Population = ​ ​ (a)  

Sample = ​ (b)  

• All U.S. Adults
• The 1600 U.S. adults surveyed
• The 81% of U.S. adults
• The 19% of U.S. adults

A normal distribution has mean μ​ and standard deviation σ​ . An x​ -value is randomly selected from the distribution. What is the probability that μ−2σ ≤ x ≤ μ+2σ​ ?

• 68%

• 95%

• 99.7%

• 100%

A data set has a normal distribution with a mean of 4800 grams and a standard deviation of 200 grams. A value from the data set is randomly chosen. What is the probability that the value is 5140 grams or less? Use the standard normal table.

Mathematical Equivalence

ON

In your class, 27% of all students say that history is their favorite subject. Is this a parameter or a statistic?

​ (a)  

• Parameter
• statistic

You flip a coin 4 times and do not get a tails. You suspect this coin favors heads. The coin maker claims that the coin does not favor heads or tails. You use technology to simulate 200 random samples of flipping a coin 50 times. The histogram shows the results. What should you conclude when you flip the actual coin 50 times and get 24 heads?

• The maker's claim is most likely true

• The maker's claim is most likely false

• Cannot determine from the information

• This represents a cluster model survey.

A researcher asks 50 people whether they have visited Arizona.

Identify the method of data collection described in the situation.

​ (a)  

• survey
• experiment
• observational study