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A sample of 20 students who had recently taken elementary statistics yielded the following information on brand of calculator owned. (T = Texas Instruments, H = Hewlett Packard, C = Casio, S = Sharp):
(a) Estimate the true proportion of all such students who own a Texas Instruments calculator.
(b) Of the 9 students who owned a TI calculator, 4 had graphing calculators. Estimate the proportion of students who do not own a TI graphing calculator.
can a pretest on mathematics skills predict success in a statistics course? the 82 students in an introductory
Calculate the range, variance, and standard deviation for these sample data.
Explain how a matched pairs experiment should be conducted to compare texting and typing speeds. Be sure to explain the role of randomization, and why it is important in this experiment and how should randomization be used in this experiment
In each of the following cases. find the mean , variance and standard of the sampling distribution of sample proportion p.
Calculate the limits within which the weight of the packets should lie assuming that the machine is not been classified as faulty.
minnesota lakes are full of walleye fish. the probability that a walleye could be caught in an attempt is 0.2. suppose
Use this sample information to test whether or not there has been a change in the average duration of long distance phone calls. Use a .05 level of significance. What is the p value?
At the .05 significance level, is the number of units produced on the afternoon shift larger?
The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
Some authorities claim that globalization has led to greater income inequality in the U.S. and globally while others claim that inequality is due to improvements in technology and productivity. Using the Library and Internet sources, do the follow..
A TV spot in the Channel 22 early news costs $1500. The average quarter hour Adult 25-54 audience is 15,000. What is the CPM?
In a simple random sample of 30 days, what is the probability that the mean number of daily emergency admissions is between 75 and 95?
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