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A statistical analysis of 1,000 long-distance calls made from the headquarters of the Bricks and Clicks Computer Corporation indicates that the length of these calls is normally distributed with μ = 240 seconds and σ = 40 seconds.
a) What is the probably that a call lasted less than 180 seconds?
b) What is the probability that a particular call lasted between 180 and 300 seconds?
c) What is the probability that a call lasted between 110 and 180 seconds?
d) What is the length of a call if only 1% of all calls are shorter?
a. What is the probability of a type I error? b. Give the formula for the test statistic.
The bank wants to find out the waiting time of their customers during the Friday evening hours from 5pm to 8pm. Using the data in ungrouped form, compute the Standard Deviation, using the computational formula.
The amounts of money requested on home loan applications at a particular bank follow the normal distribution, with a mean of $80,000 and a standard deviation of $24,000. A loan application is received during the day.
The national sporting goods association conducted a survey of persons 7 years of age or older about participation in sports activities the total population in this age group was reported at 248.5 million with 120.9 million male and 127.6 million f..
Normal approximation to the Binomial distribution - Evaluate the probability that at least 195 of the students are female.
Suppose that past data are not available for developing a planning value for p; therefore, you will use p = 0.050 for the planning average.
Enter relative proportions of the 3 samples in order (20,50,30) in "Expected values" area.
Here is a scatterplot of average crawling age versus average outdoor temperature six months after birth followed by a plot of the residuals versus average outdoor temperature six months after birth.
A study of 40 bowlers showed that there average score was 186 the standard deviation of the population is 6. Find the 95% confidence interval of the mean score for all bowlers.
Each vehicle had the gallon of gas added to the empty tank and then driven until empty. Number of miles travelled for all twelve readings are below. Use data to compute the mean and median mileages.
Explain the logic of what you have done, writing as if you are speaking to someone who has never heard of correlation (but who does understand the mean, deviation scores, and hypothesis testing);
Determine x-bar and s for this data set. You may suppose the values for bulb life are normally distributed. Use traditional method to make your decision.
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