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1) A random sample of customer order totals with an average of $78.25 and a population standard deviation of $22.50. Calculate a 90% confidence interval fro the mean, given a sample size of 75 orders 2) A random sample of 35 teenagers averaged 7.3 hours of sleep per night. Assume the population standard deviation is 1.8 hours. Calculate a 98% confidence interval for the mean. 3)A company claims the average time a customer waits for help is 4.78 min. Assume the population standard deviation for wait time is 1.8 min. Test the company claim at the α = 0.05 significance level by comparing the calculated z-score to the critical z-score.
a study was conducted to determine the impact of social media use on student learning. a total of 103 students taking a
The company wants to perform a hypothesis testing. Which of the following are the right hypotheses and what is the α-risk associated with the x' chart?
a new program is developed to enrich thekindergarteneperience of children in prepararion doe first grade. hillmont
quantitative analysis for decision making class please write for each summarizing with highlights of the review items
What can we say about the shape of the distribution of the sample mean?
1 labforensic collection and analysis of persistent datawrite up your lab experience including the necessary steps
Using the data on the growth rate of Money and inflation, run a regression of the rate of inflation on the rate of growth of the money supply
What is the unregulated competitive equilibrium and what is the social optimum specific tax (per unit of output of gunk) results in the social optimum
a screening test for a newly discovered disease is being evaluated. in order to determine the effectiveness of the new
What is the expected total inventory holding and ordering cost per year and how many days should one order last on average?
A dean of college of business in the Midwest claims
A researcher hypothesizes that people who listen to music via ear buds have greater hearing loss than those in the general population. On a standard hearing test, the mean (μ) is 24.75. Higher values indicate better hearing
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