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One of your distributors reports an average of 175 sales per day. You suspect that the average is different from 175, so you select 42 days and determine the number of sales each day. The sample mean is 166 with a standard deviation of 20 sales. At alpha= 0.01, is there enough evidence to doubt the distributor's reported average
liste below are the heights of fathers and sons. find the value of r and use a significance level of 5 to determine
barbara is a research biologist for green carpet lawns. she is studying the effects of fertilizer type temperature at
Find out the upper and lower bounds on average life expectancy of the Canadian women such that at least 90% of all population is included.
Suppose that the average number of years to graduate at a university is 4 years, with a standard deviation of 0.5 years. From the Empirical Rule, what is a range of values that 95% of the students should graduate between?
How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?
Using the sample information given in the above exercise, the p value for testing Ho versus Ha can be calculated to be 0.0057
a multiple choice test consists of 60 questions. each question has 4 possible answers of which one is correct. if all
Cathy and Jen plan to meet at a cafe, and each will arrive at the cafe at a random time between 11:00 AM and 11:30 AM, independently of each other. Find the probability that the first to arrive has to wait between five and ten minutes for the othe..
Identify the independent and dependent variables and describe how they are being operationally defined in your research project. Identify the type of data being used. Describe your sample using descriptive statistics
in a survey of 606 males ages 18-64 397 say they have gone to the dentist in the past year. construct 90 and 95
determine the sample size needed to calculate a 95 confidence interval for a proportion with a margin or error of
Estimate the input offset current assuming zero input offset voltage. If the input offset voltagecan be as large as 1 mV of unknown polarity, what range of offset current is possible?
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