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The percent defective for parts produced by manufacturer is targeted to at 4% the process is monitored daily by taking samples of n=160, today the number of defective parts were 17 what would be a 95% confidence interval for proportion defective?
At the 5% level of significance, test whether the proportion of internet users paying bills online is now more than 50%.
In part b, the sample have greater variability than part a, but the sample sizes are unchanged. how does the larger variability affect the size of the standard error for the sample mean?
Find the lowest possible score a candidate can score and still qualify. Assume the scores are normally distributed.
Specify the appropriate null and alternative hypotheses if we wish to test the research hypothesis that the mean GHQ score for all employed men exceeds 10.
Suppose a student received the following grades for the semester: History, B; Statistics, A; Spanish, C; and English, C. History and English are 5 credit hour courses
Determine the coefficient of correlation. Interpret the relationship between BAC and age using the correlation coefficient. Determine the coefficient of determination. Interpret.
Customer's arrive at See's Candy Store at a rate of 2 every 5 minutes. What is the probability that no customers will arrive in a 5 minute period?
An auditor for a large oil corporation has taken a random sample of monthly credit card charges for 32 individual (non-corporate) accounts.
Do the sample data present sufficient evidence to reject the manufacture's claim? Test using a a=0.05. What is the p-value of the test.
A sample of 100 orders revealed that 82 were delivered within the promised time. At the 0.10 significance level, can we conclude that less than 90% of the orders are delivered in less than 10 minutes?
Describe the sampling distribution model of this mean.
Obtain a test statistic and p-value. Interpret the results at = .01.
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