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A certain company relies heavily on phone orders. Suppose past records show that R% of all incoming phone calls to this company are orders from customers. At least how big must R be for you to be at least 90% sure that the first phone order of the day will occur on or before the tenth incoming call of the day?
Use Random Number Generation (RNG) in Analysis ToolPak of Excel to generate n = 5 observations from the Normal distribution N(20, 5). Construct the 95% confidence interval for μ.
According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.
A doctor believes that the variance of systolic blood pressure is 470. A random sample of 20 patients found a variance of 525. What is the smaller critical value that would be used in a hypothesis test at a .05 significance level?
Explain which data techniques you are most familiar with/have used: in a previously done project that involved the collection and analysis of data and explain why the examination of collected data is so important.
To report their finding they want to create a 90% confidence interval. What would be the margin error for this confidence interval?
Assume that company A makes 80% of all electrocardiograph machines, company B make 15% of them, and the company C makes the other 5%.
At alpha = 0.05, is there enough evidence to conclude that proportions vary from those in the study?
Results were analyzed using one -way ANOVA and included SSTR =7 , 102 and SSE = 10 ,511. Are all 8 tapes equally appealing on average? Determine p value?
It has been reported that the average US office worker receives 14 fax messages per day. For purposes of this exercise, we will assume that the daily number of fax messages is normally distributed with a standard deviation of 5.0 messages.
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion.
The Gallup organization conducted a telephone survey with a random selected national sample of 1005 adults, 18 years and older. The survey asked the respondents, "How would you describe your own physical health at this time? "Response categories w..
The university policy department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows a Poisson distribution with mean of 6.0 tickets per day. Find the p..
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