Question 10.34

nasdaq72814

34. NASDAQ Stock Prices. The table provides the start-of-trading and end-of trading prices for the eight most active stocks on July 28, 2014. Assume that the differences are normally distributed.

Stock End-of-trading
price		 Start-of-trading
price
Sirius XM $3.38 $3.44
Apple $99.02 $97.67
Facebook $74.92 $75.19
Micron Technology $31.98 $33.42
Dollar Tree $54.87 $54.22
Intel $34.23 $34.25
Microsoft $43.97 $44.50
Cisco Systems $25.92 $25.97
Table 10.17: Source: NASDAQ.com.
  1. Find the mean of the differences, , and the standard deviation of the differences, .
  2. Test whether the population mean difference in share prices differs from zero, using level of significance a .