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A national sample of 2728 adults, aged 18 and older, surveyed over the telephone (using bother landlines and cell phones) revealed that 66% reported that they had given "quite a lot" of thought to the upcoming elections. Is there any evidence that the percentage has changed from the reported benchmark of 58% during the same timeframe before the previous election?
a) what is the null hypothesis? Find the z-score of the observed proportion calculate the value of the test statistic. z =
b. What is the alternative hypothesis? Compare the z-score to the critical valye for a = 0.001 significance level using two sided alternative. Find the critical value z* = compare the z-score to the critical value
c) Explain the conclusion. Has it failed to reject or rejected the null? Is there sufficient
a coal company wants to determine a 95 confidence interval estimate for the average daily tonnage of coal that they
A survey found that women's heights are normally distributed with mean 63.6 in and standard devistion 2.5 in. a branch of the military requires women's heights to be between 58 in and 80 in. What is the percentage of women who meet the height requ..
For a sample of 20 stations last Tuesday the correlation was .78. At the .01 significance level is the correlation in the population greater than 0? t= .78-20.00/.01SQRT 20=?
A sample of eight male professionals has an average yearly salary of $52,165. Find the average yearly salary for the 11 people.
First side effect is observed. Use the formula for the sum of a geometric sequence to show that the probabilities in the probability distribution table add to 1.
Reflect on radical expressions and their applications, and then consider how you might apply radical expressions to your daily life. Explain this application,
if a study had a result of f 2 147 4.56 p 0.003 how many groups were in the study and what was the sample
when do children in the united states develop preference for brand name products? in a study reported marketers showed
The Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
a fault-tolerant system that processes transactions for a financial services firm uses three separate computers. if the
a biologist is studying the gestation period of domestic dogs. fifteen dogs are observed during pregnancy and are found
When we say we have confidence level of 95% what do you believe our "margin of error" is?
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