# Question: In Figure 4 19 we visually inspected the relative frequency histogram

In Figure 4.19, we visually inspected the relative frequency histogram for sample means based on two measurements and noted its bell shape. Another way to determine whether a set of measurements is bell-shaped (normal) is to construct a normal probability plot of the sample data. If the plotted points are nearly a straight line, we say the measurements were selected from a normal population. A normal probability plot was obtained using Minitab software. If the plot-ted points fall within the curved dotted lines, we consider the data to be a random sample from a normal distribution.

a. Do the 45 data values appear to be a random sample from a normal distribution?

b. Using the values of y in Table 4.9, compute the correlation coefficient and p-value for the normal quantile plot to assess whether the data appear to be sampled from a normal distribution.

c. Do the results in part (b) confirm your conclusion from part (a)?

a. Do the 45 data values appear to be a random sample from a normal distribution?

b. Using the values of y in Table 4.9, compute the correlation coefficient and p-value for the normal quantile plot to assess whether the data appear to be sampled from a normal distribution.

c. Do the results in part (b) confirm your conclusion from part (a)?

**View Solution:**## Answer to relevant Questions

Suppose a population consists of the 10 measurements (2, 3, 6, 8, 9, 12, 25, 29, 39, 50). Generate the 45 possible values for the sample mean based on a sample of n 5 2 observations per sample. a. Use the 45 sample means to ...Refer to Example 5.4. Suppose an estimate of s is given by σ = 5 .75 a. If the level of confidence remains 99% but the desired width of the interval is reduced to 0.3, what is the necessary sample size? b. If the level of ...Refer to Exercise 5.21. Compute the power of the test PWR(μa) at μa = 2.1, 2.2, 2.3, 2.4, and 2.5. Sketch a smooth curve through a plot of PWR(μa) versus μa. a. If α is reduced from .05 to .01, what would be the effect ...A tobacco company advertises that the average nicotine content of its cigarettes is at most 14 milligrams. A consumer protection agency wants to determine whether the average nicotine content is in fact greater than 14. A ...The amount of sewage and industrial pollutants dumped into a body of water affects the health of the water by reducing the amount of dissolved oxygen available for aquatic life. Over a 2-month period, eight samples were ...Post your question