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The average time scheduled for a doctor's visit is 11 minutes with a standard deviation of 4 minutes. A researcher uses a sampling distribution made up of samples of size 91.
According to the Central Limit Theorem, what is the standard error of the mean?
What pattern in the data would suggest improvement over time? Did you improve over time? Among the members of the class, find one that showed marked improvement over time.
a. What is the area between 415 pounds and the mean? b. What is the area between the mean and 395 pounds? c. What is the probability of selecting a value at random and discovering that it has a value of less than 395 pounds?
The data (in milliamps) are shown below. Using the .05 level of significance, are there any differences in the three categories.
1. Explain how the sources of variability contribute to the F ratio. 2. Explain the relationship between Treatment and Error variance.
The laboratory technician accidentally mixed NaHCO3 with BaCl22H2O instead of KCl when preparing unknown mixtures for this experiment.
A survey investigating whether the proportion of today's high school seniors who own their own cars is higher than it was a decade ago finds a P-value of 0.017. Is it reasonable to conclude that more high-schoolers have cars? Explain.
If after one year, the annual mileage of privately owned cars is normally distributed with mean 14,000 miles and standard deviation 3500.
If each task is analyzed separately as the researchers did in their report, what is the appropriate statistical method to use? Explain your answer.
judgmental forecasting and managerial issuesgive a scenario preferably related to your area of expertise or work
1. Find the standard deviation for this set of data to the nearest hundredth. 2. Did you calculate the sample or population standard deviation? 3. How many hotels have ratings that fall within one standard deviation of the mean?
Find the p-value for the test of hypothesis with the alternative hypothesis that the mean time to eat a 1-pound Whoopie Pie is more than 2 minutes.
A similar survey of 37,000 adults in the US in 1966 found that 43% of adults were current smokers. Construct a 95% confidence interval for the difference between proportions of current smokers in 1991 and 1965.
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