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A company that produces cell phone batteries claims their new battery last more than 30 hours.
To investigate this claim a consumer advocacy group collected the following random sample for number hours that each battery worked:
50, 40, 35, 25, 60, 55, 30, 50, 30, 20.
Is there a sufficient evidence to accept the company's claims using 0.01 significance level?
if the null hypothesis for the f-test has been rejected a researcher can use either the scheffe or tukey test to
In a survey of 750 senior business executives by Business Week magazine, 56% indicated that they felt that even if merit and abilities are equal, people with MBAs often get promoted faster than people without the degree. Prepare a 92% confiden..
Given the following data from two independent samples, conduct a one-tailed hypothesis test to determine if the first sample mean is larger than the second sample mean, given a 0.05 level of significance.
The conservative degrees of freedom for the t distribution are and The standard error, conservative degrees of freedom
a statistics student plans to use a ti-84 plus calculator on her final exam from past experience she estimates that
the piron software company currently develops marketing software for primarily service-based organizations. they
Draw a histogram of this data. Be sure to give labeled scales. Use the given table and/or the histogram to answer the following questions:
assume that adults have iq scores that are normally distributed with a mean of u105 and a standard deviation o15. find
In a survey about soft drinks it was found that 5% of the respondents like diet soft drinks. 12% of them liked the brand Coke. Of all the Diet soda drinkers 40% liked Coke.
A researcher wishes to estimate within $300 the true average amount of money a country spends on road repairs each year. If she wants to be 90% confident, how large a sample is necessary? The standard deviation is known to be $900.
If 60 percent of those people chewing the gum are successful in stopping smoking, what is the probability that in a group of four smokers using the gum at least one quits smoking?
two airplanes are flying in the same direction in adjacent parallel corridors. at time t 0 the first airplane is 10 km
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