A college teacher wishes to estimate the mean number of hours worked per week at non-college related jobs by full-time students at the college. He desires a margin of error of 1.5 hours. Past studies suggest that a population standard deviation of 14.5 hours is reasonable. Estimate the minimum sample size needed to estimate the population mean with the stated accuracy.
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For the given event, state whether the difference between what occurred and what you would have expected by chance is statistically significant or…
For the given event, state whether the difference between what occurred and what you would have expected by chance is statistically significant or not statistically significant. In 36 rolls of two six-sided dice, the numbers on the dice add to 2 ten times.
Suppose you have an experiment where you flip a coin three times. You then count the number of heads.) State the random variable.) Write the…
Suppose you have an experiment where you flip a coin three times. You then count the number of heads. a.) State the random variable. b.) Write the probability distribution for the number of heads. c.) Draw a histogram for the number of heads. d.) Find the mean number of heads. e.) Find the variance for the number of heads. f.) Find the standard deviation for the number of heads. g.) Find the probability of having two or more number of heads. h.) Is it unusual to have the three flips result in two heads? Why or why no
True or False: A boxplot is a useful way of examining the distribution of a dichotomous variable.
True or False: A boxplot is a useful way of examining the distribution of a dichotomous variable. (I answered false because boxplot and histograms are for continuous variables not categorical variables that often uses bar graphs where each category gets its own bar. Is this right or wrong?)
The sample space S is all the ordered pairs of two whole numbers, the first from one to three and the second from one to four. (Example: (1,4)).
The sample space S is all the ordered pairs of two whole numbers, the first from one to three and the second from one to four. (Example: (1,4)). a. S=___________ let event A= the sum is even and event B= the first number is prime. b. A=_______, B=_________ c. P(A)=_______, P(B)=___________ d. A AND B=__________, A OR B =________ e. P(A AND B)=_______, P( A OR B)=_________ f. B’=________, P(B’)=_________ g. P(A) + P(A’)=_______ h. P(AB)=_____, P(BA)=______; ads the probabilities equal?