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Let X be normally distributed random variable with mean u and variance s2= 4.84. Determine the the size of the sample required to be 90% confident that the error in the estimation is of u is at most 0.4.
Class where the mean is 85 and the standard deviation is 4.59, who did better relative to their class? Note both did better than the class mean. How do you answer this question?
Multiply by 50 to get the middle 95% of the distribution of the gamblers winnings on nights when he places 50 bets. (d) What is the probability that the gambler will lose money if he makes 50 bets?
a decision makers philosophy is to always be very cautious with company funds as not to arouse suspicion with the sec
suppose a previous study has shown the sample standard deviation of a particular model of automobile to be 3.12 mpg.
Military radar and missile detection systems are designed to warn a country of enemy attacks. What is the probability that 1 detection system will detect an attack.
Ann and Jim, two employees in a fast-food restaurant, play the following game while waiting for customers to arrive: Jim pays Ann 2 cents if the next customer does not arrive within 1 minute; otherwise, Ann pays Jim 2 cents. Determine Jim's averag..
In a pilot study, five kids are given several problems of each type to practice (and then tested on three problems), in one of the three Sequences: D-R-T, T-D-R, OR R-T-D.
1 true or false a t-statistic estimates the standard error by using the sample variance to approximate the population
The following data (in pounds), which were selected randomly from a normally distrubuted population of values, represent mearsurements of a machine part that is supposed to weigh, on average, 8.3 pounds.
an airport limousine can accommodate up to four passengers on any one trip. the company will accept a maximum of six
Make a plot of the ratio of the number of boys born per year to the number of girls in the U.S. What do you see? In what year did we see the most total number of births in the U.S.?
a data set consists of 247 test scores. over a long period it has been found that the mean and standard deviation for
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