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Most US adults have social ties with a large number of people, including friends, family, co-workers, and other acquaintances. It is nearly impossible for most people to reliably list all the people they know, but using a mathematical model, social analysts estimate that, on average, a US adult has social ties with 634 people.1A survey of 1700 randomly selected US adults who are cell phone users finds that the average number of social ties for the cell phone users in the sample was 664 with a standard deviation of 778. Does the sample provide evidence that the average number of social ties for a cell phone user is significantly different from 634, the hypothesized number for all US adults?
thirty percent of american parents allow their children under age 13 to stay home alone after school. source united
charter southeast airlines states the flight between fort lauderdale florida and los angeles takes 5 hours and 37
Based on the Nielsen ratings, the local CBS affiliate claims its 11 p.m. newscast reaches 41% of the viewing audience in the area. In a survey of 100 viewers, 36% indicated that they watch the late evening news on this local CBS station. What is t..
The "greasers" are working in te pits guarantee that the oil change will take no longer than 20 minutes. If it takes longer that that, a customer will only have to pay half-fare. What is the approximate percentage of customers that can expect to p..
What is the arithmetic mean of the Alaska unemployment rates? Find the median and the mode for the unemployment rates.
how can you do a regression analysis on excel to predict your sales for the next 5
Explain how the null hypothesis is the basis of this calculation. Determine the value of the relevent test statistic and the corresponding p-value.
What proportion of the adult men in United States are more than feet tall? (Hint: feet inches.) Round your answer to at least four decimal places.
electrical engineers recognize that high neutral current in computer power system is a potential problem. a recent
Two men are carrying a girl on a large plank that is 10m long and weights 200N. If the girl on a plank weighs 445N and sits 3m from one end, how much weight must each man support?
Construct a 95% confidence interval estimate for the proportion of Americans who decided what to make for dinner either at the last minute or that day.
Let p vary from 0.02 to 0.20 in increments of 0.02. b) Sketch the graph of the probabilities of the lot acceptance as the p value varies from 0.02 to 0.20.
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