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In a sample of 1000 students from four-year colleges, the mean score on a quantitative literacy test was 310 with a standard deviation of 114. Find the margin of error for this estimate at a confidence level of 95%.
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
The number of items rejected daily by a manufacturer because of defect for the last 30 days are 22, 21, 8, 17, 25, 20, 18, 19, 14, 13, 11, 6, 21, 23, 4, 19, 11, 12, 16, 16, 10, 28, 24, 6, 21, 20, 25, 5, 17, 9. Complete this frequency table for the..
Given the consumer is 18 to 24 years old, what is the probability that the consumer uses a plastic card? Given the consumer is over 24 years old, what is the probability that the consumer uses a plastic card?
Do the confidence interval limits contain 98.6F? What does the sample suggest about the use of 98.6F as the mean body temp.
She is interested in testing the null hypothesis that the mean SAT score is the same for each type of schooling using the one-way ANOVA. Some summary statistics for the three groups are given below, followed by the one-way ANOVA table.
What is the probability of finding exactly four watch soap operas?
Calculate the expected number of days it takes to get the order and standard deviation.
Take a deck of cards. A deeck has 52 cards with two major colors(Red and Black), with 26 cards each. Red colors comes in two shapes(heart and diamond)
What is the probability that at least one of the alterations is discovered? Find the expected value and variance of the number of altered accounts discovered during the audit.
Make a purchase using the internet. Test the claim that the proportion of consumers ages 35-44 who plan to make purchases using the internet has increased at α = 0.01.
When the p-value is used for hypothesis testing, the null hypothesis is rejected if
The effectiveness of treating respiratory infections with herbal remedies was studied. "Days of fever" was used to measure effects. Among 356 children treated with herbal remedies, teh mean number of days with was 0.36,
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