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Question: A zircon semiconductor is critical to the operation of a superconductor and must be immediately replaced upon failure. Its expected lifetime is 100 hours, and its standard deviation is 34 hours. If 22 of these semiconductors are available, approximate the probability that the superconductor can operate for the next 2000 hours. (That is, approximate the probability that the sum of the 22 lifetimes exceeds 2000.)
A business researcher uses two-way ANOVA in a report for a client. The researcher does not check the assumptions of using the technique.
The current advertising campaign for a major automobile brand would be changed if fewer than 70 percent of the consumers like it.
Indicate which of the following situations involve descriptive statistics and which involve inferential statistics:
the 2002 new york city housing and vacancy survey showed a total of 59324 rent controlled housing units and 236263
A marketing research analyst collects data for a random sample of 100 customers out of the 400 who purchased a particular "coupon special".
a random sample of 81 credit sales in a department store showed an average sale of 68.00. from past data it is known
A. Find and interpret the median box office dollars for the ten top-grossing DreamWorks animated movies B. Find and interpret the interquartile range for these movies.
a researcher is interested in the effect of st. johns wort on memory. a group of 25 college students is selected to
Find the 90% confidence interval for the standard deviaiton of the ages of seniors at Oak Park College if a sample of 24 students has a standard deviation of 2.3 years. Assume the variable is normally distributed.
What is the probability that 0, 1, 2, or 3 hypertensives will be identi ed in such sibships if the hypertensive status of 2 siblings in the same family are independent events?
Which month has the smallest range?- Write a brief comparison of the ozone levels in January and June.- Write a report on the annual patterns you see in the ozone levels.
A freight-hauling firm estimates that it will need a new forklift in six years. The estimated cost of the vehicle is $40,000.
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