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The average number of weeks that banner ads run at a Web site is estimated to be 5.5. You want to check the accuracy of this estimate.
A sample of 50 ads reveals a sample average of 5.1 weeks with a sample standard deviation of 2.3 weeks. State the null and alternative hypotheses and carry out the test at the 5% level of significance.
if the computed value of a chi-square statistic is less than the critical chi-square value reject the null hypothesis
let x the number of flaws on the surface of a randomly selected boiler of a certain type have a poisson distribution
The number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct
A local computer sales office sent the following information about the computer system installation. Identify the critical path by computing the ET, LT, TS and FS values.
This sample has a mean weight of 5.03 Kg and a standard deviation of 0.21 Kg. Can we calculate that the mean weight produced by the machine has increased? Use 5% level of significance.
question listed below is the net sales in million for home depot inc. and its subsidiaries from 1993 to 2004.yearnet
What sample size is needed to estimate with 95 persent confidence the mean intake of calcium within 20 units of the true mean if the intake is normal with a variance of 1900 units?
1. Rabbits like to eat the cucumbers in Mimi's garden. There are 10 cucumbers in her garden which will be ready to harvest in about 10 days. Based on her experience, the probability of a cucumber being eaten by the rabbits before harvest is 0.30.
the variance of a sample of 81 observations equals 64. the standard deviation of the sample equalschoose one answer.a.
show that if x and y are independent then e x y y e x for all y a in the discrete case b in the continuous
the readylite company produces a flashlight in which product managers are trying to decide how long a warranty to
a fair six sided die is rolled 10 times. calculate the expected value of the sum of the numbers observed. then compute
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