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The life span of a battery is normally distributed, with a mean of 2000 hours and a standard deviation of 50 hours. What percent of batteries have a life span that is more than 2055 hours?"
Would it be unusual for a battery to have a life span of more of 2055?
The number of messages sent to a computer bulletin board is a Poisson random variable with a mean of 5 messages per hour.
the computer-science aptitude score x and the achievement score y measured by a comprehensive final were measured for
A local hardware store claims that the mean waiting time in line is less than 3.5 minutes. A random sample of 20 customers has a mean of 3.7 minutes with a standard deviation of 0.8 minute. If α = 0.05, test the store's claim.
how many chocolate chip cookies will he need to sample to estimate the mean to within 2, what is a 99% confidence interval for the average number of chips per cookie?
The accomanying table is a one way, independent groups ANOVA summary table with part of material missing.assuming an equal number of subject are there in each group. What is the value of F crit, using alpha 0.05?
You are appraising the quality of diamonds for your importer. A diamond without a clear center (opaque center) shall be downgraded and sold at discount.
a farmer believes that the yields of his tomato plaints have a normal distribution with an average yield of 11 lbs and
Delivery Format The General Social Survey asks, "About how often did you have sex in the past 12 months?" About 47% of respondents indicated they had sex at least once a week.
how often do you have to toss a coin to determine pheads within .1 of its true value with probability at least
when an opinion poll calls residential telephone numbers at random only 20 of the calls reach a live person. you watch
a local trucking company fitted a regression to relate the travel time days of its shipments as a function of the
Why is cumulative relative frequency distribution so much more informative that just relative frequency distribution? Use examples to explain these differences.
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