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A sample of 35 workers was randomly selected from a workforce of 110 to estimate the average amount spent weekly at a canteen by each worker.the sample meam was $13 and the sample standard deviation was $3.25.(i) calculate a 95% confidence interval for the mean. (ii) the canteen owner argues that the average amount spent by each worker per week is $10, test at 5% significance level the claim of the canteen owner.
The length of a particular telemarketing phone call, x, has an exponential distribution with mean equal to 1.5 minutes.
What is the probability that at least 2 out of 5 randomly selected people in the study will pay more than the amount found in part (a)?
Mean SAT score is computed for each sample. If the sample size is n=2,500, find the mean and standard deviation of the distribution of sample means.
The test grades at a large school have an approximately normal distribution with a mean of 50. What is the standard deviation of the data so that 80% of the students are within 12 points (above or below) the mean?
The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with a = 0.05.
Would you play this game if you wanted to make money? What do we expert the value of the results of the game to be?
In brief describe three situations in which the 'First In First Out' discipline rule is not applicable in queuing analysis. Provide examples of four situations in which there are limited, or finite population.
Give a brief definition and an example of the following: a. Descriptive Statistics b. Inferential Statistics
Overall, the students' class attendance days (per year academic) is normally distributed around 180 days with a standard deviation of 15 days. What's the probability that the mean number of attendance days will be between 190 and 200?
They would like the margin of error of the 95% confidence interval for the proportion to be 0.05 or less. Use the guessed value p = 0.25 to find the required sample size.
A shipment of 10 items has two defective and eight nondefective items. In the inspection of the shipment, a sample of items will be selected and tested. if a defective item is found the shipment of 10 will be rejected.
The mean life of a battery used in a digital clock is 305 days. The lives of the battery follow normal distribution. The battery was recently modified to last longer. A sample of 20 of the modified batteries had a mean life of 311 days with a stan..
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