Statistics for Business

Answer = The first part of the graph resembles a bell shape. At the latter part of the graph it takes a sharp increase.

This is a histogram were the tail goes to the right, it means the average is larger than the median.

As discussed in the previous section, a normal distribution has particular characteristics it conforms to. i.e.

Standard deviation is a way of visualizing how spread out points of data are in a set. Using standard deviation helps to determine how rare or common an occurrence is. For example, data points falling within the boundaries of one standard deviation typically account for about 68% of data and those between (+/-)1 standard deviation and (+/-)2 standard deviations make about 27% combined. This can be better visualized by using a bell graph. Using the mean and standard deviation, the points where standard deviations occur can be drawn on the graph to better understand which data is rare and which is common.

We know that +/- 1.96 standard deviations from the mean will contain 95% of the values. So, we can get the standard deviation by:

The mean area (A) can be calculated by using the following Equation 4, where d is average diameter of the measured dowel. The volume of the dowel is then calculated by multiplying the area by the length.

At 5% level of significance, is there sufficient evidence to conclude that the proportions of errors in transactions assigned to each of the 5 memory locations are all different?

(c) The mean of the sample and the value of Z with an area of 5% in the left tail.

Standard Deviation of Mean= 0.4762Standard Deviation of Median= 0.7539The standard deviation of the Mean is smaller, which means all of the data points will tend to be very close to the Mean. The Median with a larger Standard Deviation will tend to have data points spread out over a large range of values. Since the Mean has the smaller value of the Standard Deviations, it has the least variability.

10. Identify whether these distributions are negatively skewed, positively skewed, or not skewed at all, and why.

True or False. In the standard normal distribution the standard deviation is always exactly 0.

Slide 17: This curve demonstrates a one-tail hypothesis with the critical region representing 5% showing a negative relationship.

7. Question : In a frequency distribution such as a bell-shaped curve, what does the vertical height of the curve indicate?

In this case we can infer that there are 100 seats in the plane, therefore making a total of 100% passengers. On the

The function chosen for the Gabriel’s horn tends to infinity as x approaches infinity. In other words, the function has an asymptote as the x-axis.