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) Make an Excel graph of the data on U.S. online advertising spending. (b) Discuss the underlying causes that might explain the trend or pattern. (c) Use Excel, MegaStat, or MINITAB to fit three trends (linear, quadratic, exponential) to the time-series. (d) Which trend model do you think is best to make forecasts for the next 3 years? Why? (e) Use each of the three fitted trend equations to make a numerical forecast for 2007. How similar are the three models' forecasts?
Statistics is science of conducting studies to: Solve a system of equations.
A railway company operates a number of different services. One of these connects two cities and the journey time is assumed to be normally distributed with a mean of 125 minutes and a standard deviation of 5 minutes.
What is the probability that a randomly selected monthly cell phone bill is more than $100?
Compute the value of the test statistic. (Round your answer to 3 decimal places.) value of the test statistic. What is your decision regarding the null hypothesis? Use the .05 significance level.
A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below.
Baseball games are uniformly distributed between 160 minutes and 240 minutes. What is the probability that a 9-inning game will last between 180 and 220 minutes?
At 95% confidence using the critical value approach, determine if the proportion of females in the company is significantly less than 50%.
For a new HDTV the mean number of months until repairs are needed is 36.84 with a standard deviation of 3.34 months.
The z-score of 1.33 tells you that Eric's time to get to work is 1.33 standard deviations from the mean.
Find the z-score for each score in the population. Transfer the original population into a new population of N=5 scores with a mean of μ=60 and a standard deviation of σ=8
The weekly salaries of teachers in one state are normally distributed with mean of $490 and standard deviation of $45. Determine the probability that a randomly selected teacher earns more than $525 per week?
What is the probability that a simple random sample of auto insurance policies will have a sample mean within $25 of the population mean for each of the following sample sizes: 30, 50, 100, and 400.
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