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Please state whether the statement is true or wrong and state briefly why:
1. A fastener manufacturing company uses a chi-square goodness of fit test to determine if a population of all lengths of ¼ inch bolts it manufactures is distributed according to a normal distribution. If we reject the null hypothesis, it is reasonable to assume that the population distribution is at least approximately normally distributed.
2. In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic
3. The least squares simple linear regression line minimizes the sum squares of the vertical deviations between the line and the data points.
Determine the mean for list of numbers. 6, 5, 9, 4, 14, 9 (Round to the nearest tenth)
Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean of 24.80 mpg and a standard deviation of 6.2mpg for highway driving. Assume that a normal model can be applied.
How much time should the employer allow employees to finish the job? (Round up to the nearest minute).
Suppose that 10 years ago the average annual expense for stock funds was 1.19 percent. Let µ be the current mean annual expense for all stock funds, and assume that stock fund annual expenses are approximately normally distributed.
What is the 90% confidence interval estimate of the difference between two population means.
A southern state has an unemployment rate of 6%. The state conducts monthly surveys in order to track the unemployment rate. In a recent month, a random sample of 700 people showed that 35 were unemployed.
The average could be a poor estimate of the spending of all teenagers given that only teenagers in malls were sampled.
Below, explicitly state slope of your trend line and describe what value of slope signifies in terms of this context.
Joe has started an iphone booth in the mall. His francise booth and other startup costs total $82,000. Joe expects to pay $240 per iphone unit and sell them for $390 each. Joe needs to reach a 10% profit margin.
A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?
A researcher measures a response variable Y and explanatory variable X on each of several objects. A scatterplot of the measurements is as follows.
If two events are collectively exhaustive, what is the probability that both occur at the same time?
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