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A software developer is interested in finding what the best color theme should be for an engine diagnostic program for the flight line. He is considering three different color themes (red, green, or blue). To determine which is preferred by his users he invited 60 participants to view the three different designs (colors). He then asked them which one they liked best. The table below presents the number of times each design was chosen by the participants.
Red Green Blue
14 18 28
(a) Use appropriate words and statistics to describe the statistical results. Based on this data which design should he use?
Based on past information, for the cars used, the distance traveled by a car in a day averages 170 km with a standard deviation of 40 km. What proportion of cars used in any day travel less than 100 km?
Income level of the industrial salespeople and their employment status. Be sure to state the critical value, the value of the Chi-square test statistic, and your decision (accept/reject).
If the payoff from outcome A is twice the payoff from outcome B, then the ratio of these utilities will be.
a normally distributed random variable y has std dev. 800. a random sample of 100 observations was taken from y and
Find the z-score for each student and indicate which one has a better relative position. An Art Major earned a grade of 46 on an exam with = 50 and s = 5.
Select three situations in psychology where you, the research psychologist, would be concerned about effect size in your research endeavor.
Find the probability that at least one subject experiences headaches. Is it unusual to have at least one of six subjects experience headaches?
Calculate trial control limits for the two charts and on the assumption that the R chart is in control, estimate the process standard deviation.
The value of the z-score that is obtained for a hypothesis test is influence by several factors. Some factors influence the size of the numerator of the z-score and the factors influence of the standard error in the denominator.
Think about a density curve that consists of two line segments. The first goes from the point (0, 1) to the point (0.7, 1). The second goes from (0.7, 1) to (0.9, 2) in the xy-plane. What percent of observations fall below 0.70?
About what percent of the observations lie between 55 and 65?
A vending machine that dispenses coffee into cups must fill the cups with 7.8oz of liquid. Before selling the vending machine to a college or business, the company tests the machine to be sure it is dispensing an average amount of 7.8oz of coffee.
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