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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 weights of dormitory cockroaches follow a normal distribution. 14% of the dormitory cockroaches weigh below 77 grams and 10% of them weigh above 82 grams. Find the mean and standard deviation of their weights.
Use the contingency table to find the probability that a randomly selected student (1) Has a Mastercard or a VISA (2) Has neither credit card.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
Event A occurs with probability 0.2. Event B occurs with probability 0.3. Event C occurs with probability 0.4. If A, B, and C are disjoint, then
An analysis of 1,000 cellular phone calls made from company phones at the offices of Kant, Taekitini, Moore, LLC reveals that the length of these calls is normally distributed, with m = 240 seconds and s = 40 seconds.
In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:
Find the probability that 70 randomly selected washing machines will have a mean replacement time less than 9.1 years.
Find the probability that the number of who consider themselves basketball fans is :
A random sample of 1001 University of California faculty members taken in December 1995 was asked, "Do you favor or oppose using race, religion, sex, color, ethnicity or national origin as a criterion for admission to the University of California?
Create the 95% confidence interval for proportion of adults from Country A who say human activity contributes to global warming.
The Federal minimum wage is $7.25 (effective July 2009). If an employee earns the new minimum wage, how many complaints can that employee expect to receive?
The lapping process, which is used to grind certain silicon wafers to the proper thickness, is acceptable only if 'sigma', the population standard deviation of the thickness of dice cut from the wafers, is at most 0.50 mil.
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