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Most lightbulb manufacturing companies claim that their 60-watt bulbs have an average life of 1000 hours.
A skeptic with some skill as an electrician wired up sockets and timers and lighted 40 bulbs. The life of each bulb recorded automatically. Is the companies' claim justified?
Find the bandwidth that contains 99% of the total power in the random process. - Determine how many frequency samples are needed for the frequency domain method.
suppose thw weekly amount spent on repairs at a certain computer is normally distributed with a mean of 300 and a
Find the margin of error in estimating the population mean: confidence level = 94%; sample size=86; sample mean = 113.5; and standard deviation = 12.7.
By using 0.05 level of significance, is there any evidence of difference in mean life of bulbs produced by two kinds of machines?Calculate p-value and interpret its meaning.
a population is normally distributed with mean 50 and standard deviation 10 and sample mean 50. what are the mean and
What inferential statistical tests are appropriate to answer your research question as to whether past participation and contribution will make a difference in people enjoying, and supporting an event?
The 260 business majors and 100 students from the 180 political science majors. Does this sampling plan result in a random sample? Simple random sample? explain."
What is the probability of drawing two diamonds after discarding 5 and 7.
create a binomial distribution. compute the n at 10 100 1000 and
Calculate the probability function and the probability distribution of X and identify the space of results and the underlined X random variable
a 90 confidence interval for the mpg of the ford c-max is 40.59 45.01. this interval is based on n 10. if we computed
question a researcher decides to test her hypothesis that some toys are more fun to play with than others so she
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