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1. To help your restaurant marketing campaign target the right age levels, you want to find out if there is a statistically significant difference between the mean age of your customers and the age of the general population in your town: 43.1 years. A random sample of 50 of your customers shows a mean of 33.6 years and a standard deviation of 16.2 years. Test at a .05 level of significance.
2. Part of the assembly line will need adjusting if the consistency of the injected plastic becomes either viscous or not viscous enough as compared with a value (56.00) your engineers consider optimal. You will decide to adjust only if you are convinced that the system is "not in control"; that is, there is a real need for adjustment. The average viscosity for 13 recent measurements was 51.22 with a standard deviation of 3.18. Test at ? = .01.
3. Your Detroit division produced 135 defective parts out of the total production of 983 last week. The Kansas City division produced 104 defectives out of 1,085 produced in the same time period. Is the difference in defective rates between the two divisions statistically significant? Test at a .05 level.
A company produces calculators in batches of 64. Four out of every 100 calculators are defective. State the random variable for this situation and list its values.
in a data communication system several messages that arrive at a node are bundled into a packet before they are
How do you classify statistical findings in order of power: nominal, ordinal, interval, and ratio? Give example by making up values.
If the manufacturer wants to keep the mean at 12.8 ounces but adjust the standard deviation so that only 2% of the bags weigh less than 12 ounces, how small must that standard deviation be?
Calculate the mean, median, and mode of your collected data. Show and explain your calculations
1.a fourth grade teacher gives homework every night in both mathematics and language arts. the time to complete the
a pysics lab instructor wants to estimate the time required for physic students to complete a required experiment. from
suppose a shipment of 50 cell phones has arrived from your supplier the samsing manufacturer. as the engineer for your
Sum of shaded area is equal to one. Smoothed histogram or density curve. How we view the "distribution" of a dataset can depend on how much data we have and how it is binned.
a recent report indicated an average family of four 2 parents and 2 children under the age of 16 spends 500 per month
among coffee drinkers men drink of 3.2 cups per day with a standard deviation of 0.8 cups. assume the number of coffee
Calculate expected number of interruptions per day. Calculate standard deviation.
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