Alg 2 Unit 7 Review

People in a local county are surveyed to determine if there is enough interest for a new baseball field. Data for the survey is collected at a local restaurant on the first Friday of the month. Is the data that was collected biased? Why or why not?

• Yes, because only one particular group of people were asked about the baseball field

• No, because a survey was done to see if people were interested in a new field

• Yes, because people might not be interested in a baseball field

• No, because a place in the community was used to do the survey

JSL Appliances compiles data on how many TV's they sell per week. The probability distribution for the data is shown in the graph at the left. What is the probability that in a randomly selected week, at least 3 TV's will be sold?

• 5%

• 85%

• 15%

• Need more information to answer

The average test score in Algebra 1 this semester was 75% with a standard deviation of 8 points. If the test scores are normally distributed, what percentage of test scores are between 59 and 83?

• 68%

• 95%

• 34.5%

• 81.5%

Using the given frequency table, draw a correct probability distribution graph below. (Note: If the x and y axes are not labelled correctly, full credit will not be given for this question.)

The given histogram shows the time spent in hours studying on the x-axis and the frequency of grades on the y-axis. Which is an accurate statement about skew?

• The mean is probably less than the median since the data is skewed to the left.

• The mean is probably is less than the median since the data is skewed to the right.

• The mean is probably greater than the median since the data is skewed to the left.

• The mean is probably less than the median since the data is skewed to the right.

Using the given histogram, which measure would more accurately describe the center of the data?

• median

• mean

• IQR

• range

• 31%

• 69%

• 30%

• 70%

Which is a binomial experiment?

• Flipping a coin 10 times and recording when it lands on heads

• Flipping a coin until it lands on tails

• Flipping a coin until 6 heads are recorded

• Flipping a coin 10 times and recording the birthday of each person that flipped

The cost of all types of computers at a local electronics store are normally distributed with a mean of $1,200 and standard deviation of $1000. What is the z-score of a computer that costs $3,500?

• -2.3

• 2.3

• 2.08

• -2.08

The growing time of spring flowers has a mean of 12 days with a standard deviation of 3 days. What is the probability that a randomly selected spring flower will have a growing time between 16 and 18 days? (z = x - mu / std dev)

• 3%

• 97%

• 91%

• 7%