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Can you provide some guidance as to when I should be using standard deviation vs. population standard deviation, particularly in Excel.
The data in the following table are individual temperature readings from a chemical process in oC, taken every two minutes
The data below represents a random sample of weights (in grams) from a batch of a particular product. The nominal value is 87.5 grams.
A survey of 400 people who took vacations revealed that 242 of them flew to their destination. Give a 95% confidence interval for the percentage
On your shelf, you have four books that you are planning to read in the near future.
For the following data (1.01, 0.99, 1.12, 1.27, 0.82, 1.04), calculate the standard deviation under both of these conditions.
Assume that the population of heights of male college students is approximately normally distributed with mean m of 69.09 inches and standard deviation
Twenty-five samples of size 6 resulted in x = 8.0 and R = 2.0 for the Quality Service Company's average time to complete an order.
It is well known that children with developmental delays (i.e., mild mental retardation) are slower, cognitively, than normally developing children
Company A is going to bid on a government contract. It will be a sealed bid (not known to other companies). The low bid will win the contract.
Select an article that describes research using one or more statistical tests (z, t, ANOVA, chi square, regression) as part of the data analysis.
RayWatch: will have a value between $20 and $26, with a share value of $24 being most likely.
Product sales since 1984 are: Product sales since 1984 are:
Consider the following time series data shown in the table below: How many time series are there?
Use the table below to determine P(X is greater than or equal to 2). Determine the expected value of X.
Compute a 5-period moving average for period 7.
Suppose that a company produces three different products. The sales for each product are independent of the sales for the others.
The Decision Sciences Department is trying to determine whether to rent a slow or fast copier. The department believes that an employee's time
The following are the ages of the 10 people in the video arcade at the Southwyck Shopping Mall at 10 A.M. this morning.
The following are the actual sales for the last six periods:
The management of Alaska Airlines has decided to base its overbooking policy of a stochastic single period model to maximize expected profit.
For this problem use the following contingency table:
Use exponential smoothing with and the smoothed forecast for July is 32 and determine August and September's smoothed forecasts.
Suppose the expected returns and standard deviations of stocks A and B are E(RA) = 0.17, E(RB) = 0.27, σA = 0.12, and σB = 0.21, respectively.
What is the probability the circuit will last between 2,500 and 2,750 hours.What is the probability the circuit will fail within the first 2,000 hours.