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Technology and the Internet
A computer supply store sells a wide variety of generic replacement ink cartridges for printers. A consumer group is concerned that the cartridges may not contain the specified amount of ink (30 ml). A random sample of 17 black replacement cartridges was obtained, and the amount of ink (in ml) in each is given in the table below.
Assume the underlying distribution of ink amount is normal.
a. Find a 95% confidence interval for the true mean amount of ink in each black cartridge.
b. Is there any evidence to suggest the cartridges are underfilled? Justify your answer.
Determine the probability of receiving at most three calls in a five-minute interval of time. Determine the probability of receiving exactly 10 calls in 15 minutes.
Laid-off workers who become entrepreneurs because they cannot find meaningful employment with another company are known as entrepreneurs by necessity. A major national newspaper reports that these entrepreneurs by necessity are less likely to grow..
a researcher was interested in determining whether incentives affect the response rate in surveys. a simple random
Suppose the population of IQ scores in the town or city where you live is bell-shaped, with a mean of 105 and a standard deviation of 15. Describe the distribution of possible sample means that would result from random samples of 100 IQ scores.
Suppose that p = P(female birth) = 0.5. A couple wishes to have exactly one female child in their family. They will have children until they have a girl, then they will stop having children. What is the probability that the family has three childre..
Using the Hypothesis Tests Two Sample file and a .05 significance level, test whether there is a difference in the mean salary for men versus women.
The weekly demand for a product follows a normal curve with an average of 1000 units and a standard deviation of 200 units. In how many weeks during a typical 52-week year would be above 800 units?
a two-tailed test of hypothesis was conducted and 60 values were above the median. computed z 1.61. at the 0.05 level
past surveys reveal that 30 percent of tourists going to las vegas to gamble spend more than 1000. the visitors bureau
Explain why X is a binomial random variable, and specify n and p, assuming that the participant is just guessing.- Find the mean and standard deviation for X if the participant is just guessing.
the american college health association produced the national college health assessment andy gardiner surfacing from
The new study is going to use the confidence level of 90%. The estimator or appreciative must be in 1% of the population proportion. Which is the necessary size of the sample?
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