Term 1 Week 6 Warm Ups

Warm Up 9/14/15

1. A survey shows that 53% will vote yes and 40% will vote no on an issue, with a 8% margin of error. Explain whether there is a clear preference on the issue. Also, determine the number of people surveyed.

2. Calculate the mean, mode, IQR, 5 summary, standard deviation, and variance for the data: 14, 13, 16, 9, 3, 7, 11, 12, 11, 4

Warm Up 9/15/153. To disprove a previous study that claims that

college graduates make an average salary of $46,000, a researcher records the salaries of 50 graduates and finds that the sample mean is $43,000, with a standard deviation of $4,500. What is the z-value, and can she reject the null hypothesis?

4.What percent of the normal distributionis shaded?

Warm Up 9/15/15 Alt. (P7)

3. The data set shows the amount of money spent by shoppers at Wal-Mart. Identify the outlier and describe how it affects the mean and standard deviation:35, 18, 49, 55, 282, 29, 42, 61, 19, 80, 33, 45, 67, 28, 71, 37, 48, 50, 31, 22

4. Scores on a test are normally distributed with a mean of 75 and a standard deviation of 8. Estimate the probability that a randomly selected student scored less than 87. Also, estimate the probability that a randomly selected student scored more than 87.

Warm Up 9/16/155. The temperatures of several cities in 2014 were

recorded as 73o, 75o, 76o, 37o, 48o, 66o, 71o, 39o, and 57o. Due to el nino, the temperatures in 2015 are expected to each rise by 8o. How will this affect the mean and standard deviation?

5. Use the graph atthe right:

Warm Up 9/16/15 Alt. (P7)5. In the 2007 the Mustangs scored the

following numbers of runs against opposing baseball teams during their season: 2, 6, 5, 2, 4, 6, 6, 10, 3, 19, 4, 4, 2, 3. Calculate the mean absolute deviation.

6. What percent of the normal distributionis shaded?

Warm Up 9/17/15

7. A survey shows that 55% will vote yes and 45% will vote no on an issue, with a 7% margin of error. Explain whether there is a clear preference on the issue. Also, determine the number of people surveyed.

8. Calculate the mean absolute deviation for the data: 14, 13, 16, 9, 3, 7, 11, 12, 11, 4