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The manufacturer of a computer terminal reports in its advertising that the mean life of the terminal, under normal use, is 6 years, with a standard deviation of 1.4 years. (Assume these are population values.) A sample of 90 units sold 10 years ago revealed the following distribution of the lengths of life. At the .05 significance level, can the manufacturer conclude that the terminal lives are normally distributed?
Length of life (years) FrequencyUp to 4 74 up to 5 145 up to 6 256 up to 7 227 up to 8 168 or more 6
It is better to use the median rather than the mean for a distribution when:
Re item 4, assume the critical value for this test is 4.92, and you obtain a computed statistical value of 7.45. Is there evidence to refuse null hypothesis? Describe why or why not?
Survey on marital status to determine whether the data is qualitative or quantitative
In a marketing study, 100 consumers were asked to select the best digital music player from the iPod, the iRiver, and the Magic Star MP3. To summarize the consumer responses with a frequency table, how many classes would the frequency table have?
Three times each year, the procurement manager at Phoenix contacts National\'s marketing department to place a monthly order for each of the coming four months.
At a 5% level of significance, is there evidence to conclude that the mean life is different from 375 hours?
Sketch the appropriate distribution, and locate the critical region for a = 0.05.
The hypotheses are as follows: Null Hypothesis: μD ≤ 0, Alternative Hypothesis: μD > 0. From her data, the resesarcher calculates a p-value of 0.0162. What is the appropriate conclusion? The difference was calucated as (after - before).
About 40% of the general population donate time and energy to community projects. Suppose 15 people have been randomly selected from a community and each asked whether he or she donates time and energy to community projects.
Costs of Televisions Listed below are prices (in dollars) and quality rating scores of rare-projection televisions (based on data from Consumer Reports). All of the televisions have screen sizes of 55 in or 56 in.
Determine the probability that exactly 8 of them started smoking before 18 years of age.
Why is effective sampling important when performing a hypothesis test? What could happen if your sample is not appropriate to your study?
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