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The Trade Show Bureau conducted a survey to determine why people go to trade shows. The respondents were asked to rate a series of reasons on a scale from 1 to 5, with 1 representing little importance and 5 representing great importance. One of the reasons suggested was general curiosity. The following responses for 50 people from the computers/electronics industry and 50 people from the food/beverage industry were recorded for general curiosity. Use these data and a = .01 to determine whether there is a significant difference between people in these two industries on this question. Assume the variance for the computer/electronics population is 1.0 188 and the variance for the food/beverage population is 0.9180.
The variance for a sample was found to be 49. What is the sample standard deviation?
Determine the number of stores that must be sampled in order to estimate the true proportion to within 0.05 with 95% confidence using the large-sample method.
Identify the sampling technique being used. Every 20th patient that comes into the emergency room is given a satisfaction survey upon their discharge.
The life span of a battery is normally distributed, with a mean of 2100 hours and a standard deviation of 50 hours. what percent of batteries have a life span that is more than 2185 hours? Would it be unusual for a battery to have a life span that is..
an investigator wants to assess whether smoking is a risk factor for pancreatic cancer. electronic medical records at a
Given a normally distributed variable (x), if you know that for a value of x = 244 the z-score = 2.20, what is the probability of any x value being above 244?
A quality control analyst measures the number of hours a patient in a low-risk condition waits for care at the emergency room of a small hospital. The following data are obtained for 20 patients.
1.An experiment was performed on a certain metal to determine if the strength is a function of heating time (hours). Results based on 20 metal sheets are given below. Use the simple linear regression model. ∑X = 40 ∑X2 = 200 ∑Y = 70 ∑Y2 = 545 ∑XY = 3..
starbucks coffee co. uses a data-based approach to improving the quality and customer satisfaction of its products.
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the deci..
Regression analysis is one of the most widely used statistical techniques in the social sciences. So, what is it? In your answer, apply some of the techniques we have learned to regression -
The following data represent the monthly service fee in dollars if a customer's account falls below the minimum required $1,500 balance for a sample of 26 banks
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