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The following data give the repair costs (in dollars) for 30 cars randomly selected from a list of cars that were involved in collisions.
2300 750 2500 410 555 15762460 1795 2108 897 989 18662105 335 1344 1159 1236 13956108 4995 5891 2309 3950 39506655 4900 1320 2901 1925 6896
a. Construct a frequency distribution table. Take $1 as the lower limit of the first class and $1400 as the width of each class.
b. Compute the relative frequencies and percentages for all classes.
c. Draw a histogram and a polygon for the relative frequency distribution.
d. What are the class boundaries and the width of the fourth class?
I want to establish if a new product is worth marketing. At least 85 percent of the public must express interest in the product and for those that do the average cost they are willing to pay must be at least $47.50.
If the population standard deviation is s = 10, is the sample sufficient to demonstrate a significant effect? Again, assume a two-tailed test with a = 0.05.
Bougainvilleas, mean growth rate was 2.23 inches/week and sample standard deviation was 0.77 inches/week. Determine a 90% confidence interval for mean growth rate of all Bougainvilleas.
Compute cumulative probabilities for these numbers in second column. Then create a histogram illustrating data distribution. Using generated Normal probability table, determine probability of Pr(X
Compare 2 moving averages using MSE and compute Exponential smoothing. The subsiquent data which represents demand for company ABC's products for the last 10 months.
If code is 4 random letters, and letters can be utilized multiple times, how many different possible codes are there?
The coffee/soup machine at the local bus station is supposed to fill cups with 6 ounces of soup. Ten cups of soup are brought with results of a mean of 5.93 ounces and a standard deviation of 0.13 ounces. Construct a 99% confidence interval for th..
For the 20 test scores shown, find the percentile rank for a score of 86.
Estimate a test statistic for null hypothesis H0: μ = 30 against two-sided alternative hypothesis H1 : μ ≠ 30, and by plotting this on its reference distribution.
A test was conducted to find out whether gender of a spokesperson affected the likelihood that consumers would prefer a new product. A survey of consumers at trade show employing a female spokesperson determined that 70 out of 150 customers prefe..
Steps in hypothesis test procedure - conducting a hypothesis test for some general statistic, ? say.
At α = .05, is there a difference in variances? Illustrate all steps clearly, including illustration of the decision rule.
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