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In February 2002, the Argentine peso lost 70% of its value compared to the United States dollar. This devaluation drastically raised the price of imported products. According to a survey conducted by AC Nielsen in April 2002 68% of the consumers in Argentina were buying fewer products than before the devaluation, 24% were buying the same number of products, and 8% were buying more products. Furthermore, in a trend toward purchasing less-expensive brands, 88% indicated that they had changed the brands that they purchased. Suppose that the following set of results was reported.
Number of Products PurchasedBrands Purchased Fewer Same More TotalSame 10 14 24 48Changed 262 82 8 352Total 272 96 32 400
What is the probability that a consumer selected at random:
a. purchased fewer products than before?
b. purchased the same number of products as before?
c. purchased the same number or more products than before?
d. purchased fewer products and changed brands?
e. purchased the same number of products and the same brands?
A professor is targeting a score of 80 on an exam. His forty-nine students averaged 78 on an exam with s = 7. Are the scores significantly less than 80 at a significance level of 0.05? Show your work and state the conclusion.
Carry out an ANOVA and describe in detail in a BPS-formatted Results section:
If a sample of 25 workers found that the average work week is 48 hours, conduct a hypothesis test to determine if there is significant evidence that the length of the average work week has increased? Use alpha=.05
One approach for defining elevated blood pressure is to use 90 mm Hg- the standard for elevated adult DBP- as the cutoff. What percentage of 17-year-old-boys would be found to have elevated blood pressure, using this approach?
A local bank wants to install motion detector burglar alarms. Each has a 70% chance of detecting a burglar. If the bank wants to be 99% certain of detecting a burglar how many need to be installed?
Make a scatter plot, illustrate the regression lines. Determine the correlation coefficient between husband’s and wife’s education for couples in which wife is employed full time?
At the 5% significance level, can the researcher reject the hypothesis that the mean reading scores of all children in the three school systems is the same? Formulate and test the appropriate hypotheses. Use the critical value approach.
Open data file on your excel file AirlinePassengers . Point to the level of data (nominal, ordinal, ratio, or interval) measurement for each variable in data set. Notice tab for description gives information about data.
The lengths of human pregancies are normally distributed with a mean of 268 days and a standard deviation of 15 days.
How large a sample is required to estimate the mean speed with a margin of error equal to 2 miles per hour with 90% confidence?
Assume the arrival of these emails is approximated by the Poisson distribution.
Bags of tea are sampled to ensure proper weight. The overall average for samples is 8 ounces. Each sample contains 10 bags. The average range is 0.1 ounces.
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