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Question: Consider the two conditions necessary for conducting a z-test for a proportion. One is a sample size condition, and the other is a condition about how the sample was collected. For each of the two conditions, explain why it is required in order for the test and the results to be valid.
Consider a sample space of three outcomes A,B,and C. Which of the following represent legitimate probability models?
Calculate the sample proportion successfully treated.- Determine a 95% confidence interval for the proportion of the population for whom the treatment would be successful.
Conditions 2 and 3 needed for the sampling distribution of P^ to be approximately normal are met because this result is based on a large random sample of adults. Explain how Condition 1 is also met.
Speed of light. In 1882 Michelson measured the speed of light (usually denoted c as in Einstein's famous equation ).
consider the continuous triangular distribution yx4.5 where 0ltxlt3. a what is the probability of 0ltxlt3? b what is
You then sort by random numbers in ascending order. Finally, you take the first 50 sorted employees as your sample. Does this approach constitute a statistical or a nonstatistical sample?
Make a forecast for 2005, using a trend model of your choice or a judgment forecast. Discuss. Note: Time increments are 5 years, so use t = 6 for your 2005 forecast.
Suppose we want to do this study again, picking various communities and locations at random, and hope to end up with a 98% confidence interval having a margin of error of ±4%. How many children must we observe?
Major league baseball game durations are normally distributed with a mean of 170 minutes and a standard deviation of 50 minutes.
Make a scatterplot for these data.- Describe the direction, form, and strength of the plot.- Find the correlation between horsepower and miles per gallon.- Write a few sentences telling what the plot says about fuel economy.
A coworker is considering the use of a log linear (power) model using weight to estimate the cost of a missile engine.
what are the roles of financial intermediaries differentiate between direct and indirect
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