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Does this data provide evidence that the new machine is faster than the old machine? (Give details.) Find a 90% confidence interval for the difference between the two means.
John Sullivan bought a new Brunswick Boat for $17,000. He put a $2,500 down payment on it. The bank's loan was for 60 months. Finance charges totaled $4,900. His monthly payment is:
In a recent year, Deleware had the highest per capita annual income with $51,803 . Standard deviation = $4850, find the mean that falls at the 95th percentile for a sample of 35 residents?
The library wants to take a sample to statistically estimate this mean. How large will the sample need to be to estimate the mean within 0.28 of 1 standard deviation with 0.95 confidence?
For a repeated-measures study, a small variance for the difference scores indicates that the treatment has little or no effect. True or False?
Identify a peer-reviewed journal article published within the last 5 years that uses probabilities. This article should pertain to public health. In your main post, summarize and evaluate this artic
A researcher claims that the variation in the number of days that factory workers misses due to illness is greater than the variation in number of days missed by hospital workers.
A researcher placed male rodents in the presence and absence of a conspecific male. Cortisol (a stress hormone) levels were compared at both times. What type of t-test is most appropriate for this s
An exhaustive survey of all users In a wilderness park taken in 1980 revealed that the average number of persons per party was 2.6. In a random sample of 25 parties taken in 2005, the average was 3.
Several years of study by dedicated researchers have shown that on average 4 sharks per month can be found in an area off Broad Key. What is the likelihood of finding two sharks in that area in a g
Assume that in a population of interest, the ratio of males to females is 1:1. If you choose a random sample of 25 from the population, what is the probability that the sample contains 5 or fewer ma
In a sample of 80 workers from a factory in city A, it was found that 8 were unable to read, while in a sample of 50 workers in city B, 6 were unable to read. Can it be concluded that there is a dif
The proportion of male births to female births is 51:49. In families with 6 offsprings, what is the expected frequency of families having all 6 offspring female? Plot binomial distribution for this
Following a significant one-way between-subjects ANOVA in which k > 2, what is the next appropriate step?
Each student in a class of 80 rolls 8 dice in order to perform inference about the mean of all dice rolls (which happens to be 3.5).Suppose each student uses his or her sample to test the true null
A box contains 4 red balls, 3 orange balls, and 2 yellow balls; and each ball has the same size. In how many ways can you remove (without replacement) 2 red, 2 orange, and 2 yellow balls (in any ord
If 30%of the students have never taken a statistics class, 60% have taken only one semester of a statistic class, and the rest have taken only two or more semesters of statistic, what is the probabi
The table below shows five baskets containing different quantities of oranges. (Baskets) Number of oranges (1) 30 (2) 18 (3) 30 (4) 33 (5) 36
The inflection points of a bell curve are at x = 40 and x = 52. What is the area under the bell curve between the inflection points?
Assumed that it is reasonable to believe that the population is approximately normal and the population standard deviation 63. what is the upper bound of the 95% confidence interval for the battery
A researcher uses analysis of variance to test for mean differences among four treatments with a sample of n = 8 in each treatment. The F-ratio for this analysis would have what df values?
Collect a data set with two related variables. You can create your own data set or can download a data set from a web or to use data sets that posted on project organizer. Calculate descriptive stat
Calculate the point estimate of the population proportion of those who believe that low crime is most important. (Round your answer to 2 decimal places.) Point estimate