Socially conscious investors screen out stocks of alcohol and tobacco makers, fi
ID: 3316281 • Letter: S
Question
Socially conscious investors screen out stocks of alcohol and tobacco makers, firms with poor environmental records, and companies with poor labor practices. Some examples of "good," socially conscious companies are Johnson and Johnson, Dell Computers, Bank of America, and Home Depot. The question is, are such stocks overpriced? One measure of value is the P/E, or price-to-earnings ratio. High P/E ratios may indicate a stock is overpriced. For the S&P Stock Index of all major stocks, the mean P/E ratio is = 19.4. A random sample of 41 "socially conscious" stocks gave a P/E ratio sample mean of x = 17.7, with sample standard deviation s = 5.8. Does this indicate that the mean P/E ratio of all socially conscious stocks is different (either way) from the mean P/E ratio of the S&P Stock Index? Use = 0.01.
State the null and alternate hypotheses.
H0: = 19.4; H1: < 19.4
H0: = 19.4; H1: 19.4
H0: = 19.4; H1: > 19.4
H0: 19.4; H1: = 19.4
H0: > 19.4; H1: = 19.4
(b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution.
The Student's t, since the sample size is large and is unknown.
The standard normal, since the sample size is large and is known.
The standard normal, since the sample size is large and is unknown.
The Student's t, since the sample size is large and is known.
What is the value of the sample test statistic? (Round your answer to three decimal places.)
(c) Find the P-value. (Round your answer to four decimal places.)
Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? Are the data statistically significant at level ?
At the = 0.01 level, we reject the null hypothesis and conclude the data are statistically significant.
At the = 0.01 level, we reject the null hypothesis and conclude the data are not statistically significant.
At the = 0.01 level, we fail to reject the null hypothesis and conclude the data are statistically significant.
At the = 0.01 level, we fail to reject the null hypothesis and conclude the data are not statistically significant.Interpret your conclusion in the context of the application.
There is sufficient evidence at the 0.01 level to conclude that the mean P/E ratio of all socially conscious stocks differs from the mean P/E ratio of the S&P Stock Index.
There is insufficient evidence at the 0.01 level to conclude that the mean P/E ratio of all socially conscious stocks differs from the mean P/E ratio of the S&P Stock Index.
Explanation / Answer
a)
H0: = 19.4; H1: 19.4
b) The Student's t, since the sample size is large and is unknown.
std error =std deviaiton/(n)1/2 =5.8/(41)1/2 =0.9058
tehrefore value of the sample test statistic t =(X-mean)/std error =(17.7-19.4)/0.9058=-1.877
c) p value =0.0678 ( please try 0.0679 if this does not work due to rounding)
At the = 0.01 level, we fail to reject the null hypothesis and conclude the data are not statistically significant
There is insufficient evidence at the 0.01 level to conclude that the mean P/E ratio of all socially conscious stocks differs from the mean P/E ratio of the S&P Stock Index.