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Question: You are interested in how much time students spend on the Internet each day. Here are data on the time spent on the Internet (in minutes) for a particular day reported by a random sample of 30 students at a large high school:
(a) Construct a histogram of these data.
(b) Are there any outliers? Justify your answer.
(c) Would it be better to use the mean and standard deviation or the median and IQR to describe the center and spread of this distribution? Why?
To investigate he selects a sample of eight weeks and determines the number of new cars sold and the number of sales people on duty for that week. a) What are the dependent and independent variables?
a popular web site among college students is studentinfo.com. it lists information about jobs both in the united states
Suppose that one fisher from each park is chosen at random. What is the probability that the fisher chosen from Clearwater had a license and the fisher chosen from Mountain View did not have a license?
For each of the following sampling scenarios, determine which test statistic is appropriate to use when making inference statements about the population mean.
annual per capita consumption of milk is 21.6 gallons statistical abstract of the united states 2006. being from the
Suppose they solicit 400 customers one day, and find that 250 of them have a Grayson's card. Assume that 60% of all Grayson's customers have a discount card, what is the probability of getting a sample proportion of at least 250 / 400=0.625?
Discuss the concepts of a parameter, a sample statistic, an estimator, and an estimate. What are the relations among these entities?
70% of all americans can do routine computations. If an employer were to hire 8 randomly selected americans, determine the probability distribution.
todd holland from new york grows pumpkins. he studied his past records carefully and concluded that the weights of his
In addition, the gender of the respondent is noted. After analyzing the results the following table of joint probabilities was produced: Find the probability that a customer who rates Windsor as excellent is a man. 0.45
An equal number of participants are assigned to each group. If Fobt= 4.08 for this study, then what was the decision at a 0.05 level of significance for a one-way between-subjects ANOVA?
Distinguish between checklists and observational rating scales as ways to record behavior. When do researchers use each one?
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