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Question: Hicks law predicts how long it will take a user to pick out a given element on a website page from among all the other elements on that page. Because a certain website will be used many thousands of times per year on an intranet, a major company engages a usability specialist to test whether the Hicks prediction holds on two proposed home page designs. Because the company is reluctant to have too many employees absent from work stations, it specifies that the test can involve only five individuals, and that therefore the same five people must test both proposed interfaces. We will want to know if there is a significant difference in the times for each interface. What is the appropriate test?
Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. You decide to evaluate the company's claim. In summary, in this problem you are given:
Illustrate by computation that, for straight -line regression of Y on x, β1= 0.
Measures the discrepancy b/w the data and the null hypothesis. We can make large values of T are evidence against H0 in most cases. Explain why?
The information that the distribution of the serve speeds was bell shaped. What proportion of the player's serves are expected to be between 107 mph and 118 mph?
Suppose that you select a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
Area to right of mean of normal probability distribution is?
the margin of error for a 95% confidence interval and then construct to the 95% confidence interval for the population proportion. Construct a 95% confidence interval for the population proportion p of all Twinkle bulbs.
question two automatic dispensing machines are being considered for use in a fast-food chain. the first dispenses an
Enzyme immunoassay (EIA) tests are used to screen blood specimens for the presence of antibodies to HIV, the virus that causes AIDS. Antibodies indicate the presence of the virus.
A point Y is selected at random from interval (0,1). Then another point X is chosen at random from the interval (0,Y). Find probability density function for X.
A company that has a large number of supermarket grocery stores claims that customers who pay by personal checks spend an average of $87 on groceries at these stores with a standard deviation of $22.
A random sample of 51 observations was selected from a normally distributed population. The sample mean was x = 88.6 , and the sample variance was s2 = 38.2.
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