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The Wall Street Journal reported that 33% of taxpayers with adjusted gross incomes between $30,000 and $60,000 itemized deductions on their federal income tax return. The
a. What is the
n=30 | |
n=50 | |
n=100 | |
n=400 |
b. What is the advantage of a larger
A larger sample - Select your answer -(increases/decreases) the probability that the sample mean will be within a specified distance of the population mean. In this instance, the probability of being within +/- 234 of
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- the average sales price of a single-family house in the U.S. is $235,500. you randomly select 12 single family houses. what is the probability that the mean sales price is more than $225,000? assume that the prices are normally distrubuted with a standard deviation of $50,000.arrow_forwardBased on research conducted by the government on people aged 25 to 34 years, on average, people in that age group spend $1,994 of their annual income on entertainment. Assume that the data are normally distributed with a standard deviation of $450. What percentage of the population in that age group spends between $2,500 and $3,000 per year for entertainment?arrow_forwardA large corporation employs 21,995 individuals. The average income of all employees is $64,372, with a standard deviation of $18,985 and is skewed to the right. Consider this to be the population distribution. You are given a data set consisting of the incomes of 180 randomly selected employees. What is the population standard deviation?arrow_forward
- For a sample of 120 businesses, the average profit they generate in a month is $54,000 with a standard deviation of $8,800. Find the sample standard deviation for the distribution.arrow_forwardSee photo for question details.arrow_forwardInternet providers: In a survey of 992 homeowners with high-speed Internet, the average monthly cost of a high-speed Internet plan was $65.8 with standard deviation $11.14. Assume the plan costs to be approximately bell-shaped. Estimate t number of plans that cost between $43.52 and $88.08. Round to the nearest whole number. The number of plans that cost between $43.52 and $88.08 isarrow_forward
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