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Q1) Weekly salaries of teachers in one state are normally distributed with mean of $490 and a standard deviation of $45.
a) Determine the probability that a randomly selected teacher earns more than $525 per week?
b) Determine the probability arbitrarily chosen teacher earns less than $435 per week?
At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of money a shopper spends at the store we could
State the appropriate set of hypothesis to test whether there is a relationship between the variables X and Y.
Let X be the number of yes votes obtained from a random sample of 200 out of the entire voting population. What is the expected value of X if, in fact, 65% of all voters supported the dictator?
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
Provide a discussion that supports the assumption that the variance of savings increases with family income.
This model is fit to the data using the method of least squares using statistical software, and the following parameter estimates and their standard errors are obtained.
Iindicate all samples are approximately Normal with no outliers. Is the ANOVA appropriate?
Using six-step critical value approach, at the 0.05 level of significance, is there evidence that population mean delivery time has been increased below previous population mean value of 25 minutes?
Find the relative risk for moderate beer drinkers as compared to nondrinkers, finds the 95% confidence interval
Which sessions, morning or afternoon, had more stable or uniform attendance over three-day period? Describe by using the suitable calculation for each data set and compare two calculations .
Make use of normal probability distribution features of EXCEL to help determine the probability.
A permutation resample for a two-sample test
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