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In Los Angeles there are three network television stations, each with it own evening news program from 6:00 to 6:30 PM. According to a report in this morning's local newspaper, a random sample of 150 viewers last night revealed 53 watched the news on KNBC (channel 2), 64 watched KABC (channel 7), and 33 viewed KCBS (channel 2). At the 0.05 significance level, is there a difference in the proportion of viewers watching the three channels?
1. State the null and alternative hypothesis.
2. Identify the level of significance: Given at 0.05
3. Calculate the test statistic
Category fo fe fo-fe (fo-fe)2 (fo-fe)2/fe
X2 =
4. Formulate the decision rule.
5. Make a decision.
Assume that the lives of all such bulb (approximately) normally distribution. Make the 99% confidence intervals for the variance and standard deviation of the lives of all such bulbs.
Construct a 95% confidence interval for the proportion of all those who experience some type of discomfort.
A recent study focused on the number of times men and women who live alone buy take-out dinner in a month. The information is summarized below.
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The so-called "Gambler's Fallacy" makes the mistake of not recognizing:
The owner of a local night club has recently surveyed a random sample of n=250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30.
It is estimated that 10 percent of those taking the quantitative methods portion of the CPA examination fail that section. Sixty students are taking the exam on Saturday.
The following data represents 15 quarters of manufacturing capacity utilization (in percentages) Evaluate three and four quarter moving average for this time series. Which moving average provides the better forecast for the fourth quarter of 2003?
Find the difference between the actual y value and the predicted y value for each individual, square the differences and add the squared values to obtain ss residual.
You may use the manual method of calculation, or show how MegaStat (or other software) is used to analyze the data. Be sure to discuss the interpretation of results.
Using the letter M for male and F forfemale. Define a second sample space S and where the elements represent the number of females selected.
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