Mathematics, 20.10.2020 09:01 sickboi
The summer income of the 3,408 students at Van Buren High School last year was normally distributed with mean $1,751 and standard deviation $421.
Approximately what percent of the students had incomes between $1,000 and $2,000? Round to the nearest percent.
Approximately how many students had incomes less than $800? Round to the nearest integer.
Answers: 2
Mathematics, 21.06.2019 16:20
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Mathematics, 21.06.2019 20:30
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Mathematics, 22.06.2019 01:30
Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10
Answers: 3
Mathematics, 22.06.2019 01:40
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