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A study considered risk factors for HIV infection among 500 intravenous drug users. Previous studies have shown that 45% of intravenous drug users are HIV positive.
1. What is the probability that 210 to 235 intravenous drug users in this study will be HIV positive.
2. What is the probability that at most 230 intravenous drug users in this study will be HIV positive
A major benefit of two-way ANOVA over several one-way ANOVAs, If an F test for interaction is significant.
a student wanted to construct a 95 confidence interval for the average age of students in her statistics class. she
For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are
A researcher has been measuring the time for pairs of 8 year olds who have just met each other to work together to solve a problem. Construct a distribution table for these data. include the colums and values for proportion and percentage.
the number of kernels of corn in a bag of microwave popcorn is 1262 with a standard deviation of 118 kernels.
if the level of confidence is increased while the sample size remains the same how will the width of a confidence
A box contains six parts. Two of the parts are defective and four are ok. If three of the six parts are selected from the bin, how large is the sample space?
an investigation of the effectiveness of a training program to improve customer relationships included a pre-training
Ohio Company provided the following information regarding its only product--ice skates.
a bridge culvert is designed to pass a stream discharge with an annual exceedance probability of 0.02 without
How many drinks do we have to sample if we wish the length of the 95% confidence interval of the mean to be 0.1 ounce?
A retail federation conducted a nationwide survey of 1000 adults last October and found that approximately 55% of the respondents planned to do some type of Halloween decorating.
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