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A random sample of 85 group leaders and supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for the population mean?
What is the probability that the sample mean would differ from the true mean by greater than .04 dollars if a sample of 183 5 gallon pails is randomly selected? Round answer to 4 decimal places.
A recent study by a large retailer designed to determine whether there was a relationship between the importance a store manager placed on advertising and the size of the store revealed the following sample information:
Samples of size 49 are taken from a population with a σ of 17. If the mean of the sample is 25, what is the confidence interval at the 90% confidence level?
Chi-square test for independent of attributes - A random sample of students is interviewed to determine if there is an association between class and attitude toward corporations?
You are given an annual time series with 40 consecutive values and asked to fit a fifth-order auto-regressive model.
Faced with rising fax costs, a firm issued a guideline that transmissions of ten pages or more should be sent by two-day mail instead. Exceptions are allowed, but they want the average to be ten or below. Use Excel to find the right-tail p value
Illustrate how you could use the interrupted time series design to naswer a real world research question through the use of archival data.
A business invests $10,000.00 in a savings account for 2 years, At the beginning of the second year, an additional $3500.00 is invested, At the end of the second year, the account balance is $15,569.75. What is the annual interest rate?
Could you please show me how you computed the two critical values to (2.18, 17.83) ? Which formula you used ?
Her students this semester can be considered a sample from the population of all students she might teach, so she compares their mean score with 72.
What is the probability that among 10 true hypertensives at least 50% are being treated appropriately and are complying with this treatment?
An orange juice producer buys only one kind of oranges. The amount of juice squeezed from each of these oranges is approximately normally distributed with a mean of 4.2 ounces and a population standard deviation of 1 ounce.
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