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In this case, the Central Limit Theorem states that the sample mean from a simple random sample from a large population should have an approximate Normal distribution with the se(Y ) = n . The se of Y measures the variability of Y around the true population mean when different samples of the same size are taken. Note that the variability of the sample mean is LESS than that of individual observations Does this makes sense?
What is the break-even cost? What is the profit for 75 units of feed sold? How many units must be sold to produce a profit of $1020?
Findout the 98% confidence interval for true mean. Findout a 98% confidence interval for the cigarette tax in all 50 states.
Chosen field within a year after graduation. Find the probability that 11 randomly selected graduates all find jobs in their chosen field within a year of graduating.
Assume that 5,000 sales invoices are separated into four strata. Stratum 1 contains 50 invoices, stratum 2 contains 500 invoices, stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices.
A poll found that 38% of male voters and 46% of female voters support a particular candidate. To test whether this candidate has equal levels of support between male and female voters, the null hypothesis should be:
The amount of time a bank teller spends with each customer has a population mean = 3.1 minutes and population standard deviation = 0.4 minute.
Find the minimum sample size required for estimating the overall proportion of students who passed Exam P in 2009 to within 4% with 95% confidence if it is known that this proportion is between 30% and 40%.
What is the probability that a cereal would be high calorie, given that is low fiber? In other words, what is P (high calorie, given low fiber)?
No estimate of the population proportion is available. How large a sample is required?
Describe each set of data with a histogram (use the same class intervals on both histograms) the mean, standard deviation.
The results of a recent poll on the preference of shoppers regarding two products are shown below.
A study of 35 golfers showed that their averages score on a particular course was 92. The standard deviation of the sample is 5.
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