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The time (in minutes) between telephone calls at an insurance claims office has the expo- nential probability distribution: f(x) = 0.50e ( to the -0.50x power) for x (>or equal to) 0
a. What is the mean time between telephone calls?
b. What is the probability of 30 seconds or less between telephone calls?
c. What is the probability of 1 minute or less between telephone calls?
d. What is the probability of 5 or more minutes without a telephone call?
Computing the mean and standard deviation for the given data - Find the value for the new standard deviation
In an online survey of 4,001 respondents, 8% were classified as productivity enhancers who are comfortable with technology and use the Internet for its practical value (data extracted from M. Himowitz, "How to Tell What Kind of Tech User You Are,"..
Are the data sufficient to that the herb has a significant effect on memory? Use a two-tailed test with α = .05.
gigi and ron are candidates for mayor in a city. you want to estimate the proportion of gigis voters with 90 confidence
let x denote the number of heads obtained when a fair coin is tossed 4 times.a what is ex and varx?b repeat 10 times
X is normally distributed with a mean of 250 and a standard deviation of 40. What value of X does only the top 15% exceed?
The assumption of independent error terms in regression analysis is often violated when using time series data and is called the problem of Autocorrelation.
it is decided to measure the resistance of sheets of a certain metal at temperatures x of 100 k 200 k 300 k 400 k and
Describe the situation and the variables and determine whether the variables are normally distributed or not. How could you change these to a normally distributed dataset?
Report the test statistic and p-value. What is your decision and conclusion? State any assumptions you have made. Are these assumptions satisfied with these data?
Out of 1000 respondents to a survey, 250 people planned to purchase a TV of which 200 actually purchased and 50 did not actually purchase. 750 people did not plan to purchase at TV, of which 100 actually purchased and 650 did not actually purchase.
einarsen et al. 1998 selected an srs of 935 assistant nurses from a norwegian county with 2700 assistant nurses.a total
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