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In your sock drawer you have 4 blue socks, 5 grey socks, and 3 black ones. Half asleep one morning, you grab 2 socks at random and put them on. Find the probability you end up wearing
a) 2 blue socks.
b) no grey socks.
c) at least 1 black sock.
d) a green sock.
e) matching socks.
The average time it took then to change a water pump was 18 minutes. The standard deviation of the sample was 3 minutes. Find the 99% confidence interval of the true mean.
What is the probability that the next customer will request extra unleaded gas and fill the tank (A union B)?
You have recently taken on work as the quantitative business analyst for a company that holds the DVD distribution rights for movies. The company wants to estimate the sales revenue for each DVD movie it distributes
Which statement about re-expressing data is not true? I. Unimodal distributions that are skewed to the right will be made more symmetric by taking the square root of the variable.
The chart at the right. Does this sample indicate that songs classified as dance music have lower beats per minute than the songs ranked on a Top 200 list?
1) We test the null hypothesis H0: μ = 10 and the alternative Ha: μ ≠ 10 for a normal population with σ = 4. A random sample of 16 observations is drawn from the population and we find the sample mean of these observations is x = 12. The P-value is c..
(a) Construct a 95% con?dence interval for the average percentage of impurities in this brand of peanut butter. (b) Give an approximate 95% con?dence interval for the population variance. (c) Interpret your results and test for no..
Using a random sample of 100 newly-packed Chococake, it is found that the mean shelf life is 154 hours. Can the cake house manager conclude that the new packaging technique is efficient at 0.01 significance level?
the mean weight of loads of rock is 51.0 tons with a standard deviation of 6.0 tons. if 16 loads are chosen at random
Is a body temperature of 99.00F unusual? Why or Why not? d)fifty adults are randomly selected. What is the likelihood that the mean of their body temperatures is 97.98F or lower?
The following table gives the reciprocal temperatures (x) and the corresponding observed solubilities of a certain chemical substance.
a large consumer goods company ran a television advertisement for one of its soap products. on the basis of a survey
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