The random sample of n 5 100 Americans in Example 9.7 had an average of 3400 mg of sodium per day, with a sample standard deviation of 1100 mg. Does this provide sufficient evidence to indicate that the average daily sodium intake for Americans is more than 3300?

1. Select stat ➤ TESTS ➤ 1:ZTest. Select Stats in the “Inpt:” line, and enter the values for μ0 5 3300, n and x on the appropriate lines. Enter the value for s 5 1100 on the line marked “σ.” (Notice that we are assuming that the population standard deviation, σ, can be approximated by s.)

2. Change the alternative hypothesis to μ > μ0. When you move the cursor to Calculate and press Enter, the results will appear, shown on the screen in Figure 9.18(a). With z 5 0.9091 and p-value 5 0.182, the results are not significant.

Transcribed Image Text:

NORMAL FLOAT AUTO REAL RADIAN MP 0 Z-Test >3300 z=0.9090909091 p=0.1816510401 x=3400 n=100 (b) NORMAL FLOAT AUTO REAL RADIAN MP 2-SampZTest H1 H2 z=7.050239879 p=1.798001676E-12 X1=26400 x2=25100 n1-100 n2=100 -