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Carry out the test for the variance of girls score is not significantly less than the given data.
The standard deviation of math test scores at one high school is 16.6. A teacher claims that the standard deviation of the girl's test scores is smaller than 16.1. A random sample of 22 girls results in scores with a standard deviation of 13.3. Use a significance level of 0.01 to test the teacher's claim.
Calculate and interpret standard error of estimate se and coefficient of determination R2 for these data.
At the 5% level of significance, can we infer that branch A has a significantly higher proportion of satisfied customers than branch B?
It is better to use the median rather than the mean for a distribution when:
Develop percent frequency distribution and construct bar chart and pie chart.
A survey taken in a restaurant shows the following number of cups of coffee consumed with each meal. Construct an ungrouped frequency distribution.
Calculate the mean number and median number of apples in a bag.
Assume your statistics professor reports test grades as z-scores, and you got a score of 2.20 on the midterm exam. Write down a sentence explaining what that means.
Calculated test statistic, decision about the null hypothesis interpretation of results, and a list of references consulted.
Simulate both one-and two-teller systems, calculate waiting time, average queue length, and percentage utilization for each system.
Hagger Engineering Corporation is considering undertaking several proposed projects for the next fiscal year. The projects, the number of engineers and the number of support personnel necessary for each project.
Use PHStat to make a box-whisker plot. If PHSTAT has yet to be installed, calculate Xmin, Xmax, Q 1 , Q 3 and median using equation in Class Notes-Quartiles, Percentile & Dectiles.
In addition, record the values for the UCL, center line, and LCL. Also, record any points that are out of control. Use a z-value of three.
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