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What would be the correct null and alternative hypothesis for the following situation: The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the mean speed of all cars is greater than the posted speed limit of 70 mph.
In a survey of the 3000 boy scouts in the National Capital Area Council (NCAC), it is found that they have a mean weight of 135 lbs with a standard deviation of 15 lbs. How many of the boy scouts have weights between 120 lbs and 150 lbs.?
Find the optimal order quantity and what is the optimal total ordering cost per year vs. what is that cost with the current policy?
At the 0.05 significance level, can he conclude that number of absences has declined? calculate approximately the p -value.
Conclude that the population average pulse rate is 71.8. Reject the hypothesis that the population average pulse rate is 70.
If many samples of size 1000 persons are chosen, determine the expected value (mean X-bar) or average of average IQ's for these samples?
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
Katie is studying aggression among adolescent girls. She believes that there is a relationship between the level of interaction a girl has with her mother and her level of aggression.
Four percent of the customers of a store buy cigars. Half of the customers who buy cigars buy beer and one fourth of those who buy beer buy cigars. The table is given below:
Formulate the hypotheses that can be used to determine whether the mean of all account balances is significantly different from $1,150
A coin is flipped e times and heads (h) or tails (t) are recorded:
New study is to use 90% confidence level. Estimate is to be within 1 percent of population proportion. Determine the essential sample size?
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location. Research question: At α = . 05, does vehicle type vary by mall location?
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