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Calculate the mean or expected value E(x) and the standard deviation of the probability distribution represented in the graph below (vertical axis shows the probability value P(Y=y) while the horizontal axis shows the possible values of the random variable Y)
a) What is the purpose of sampling? b) What are some concerns and dangers of sampling?
Someone volunteers to give blood. What is the probability that this donor has Type A or Type B?
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.
A new method of teaching children to read promises more consistent improvement in reading ability across students. The new method is implemented
a random sample of 15 college freshman were enrolled in a six week pilot program to improve writing skills. at the
What is the probability of accepting a shipment containing 25% defectives and calculate the mean of the sampling distribution.
A marketing research firm wishes to estimate the proportion of adults who are planning to buy a new car in the next 6 months. A simple random sample of 100 adults led to 22 who were planning to buy a new car in the next 6 months.
A car manufacturing company that makes three different types of cars wants information about customer satisfaction for cars sold during the previous year.
Chief among those changes has been a perceived deterioration of world stability, not only in terms of economics but also in terms of security. What indicators could lead one to conclude that in the years following the collapse of the Communist wor..
Determine whether the evidence is enough to reject the salesperson's claim. Establish the Null and alternative hypothesis, and choose the right test statistics.
The weight of oranges growing in an orchard is normally distributed with a mean weight of 8 oz. and a standard deviation of 1.5 oz.
Examine demographic variables as potential confounders
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