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Assume you are the manager of a mustard seed factory in Colombia. Your company has received complaints that there is not enough mustard
Of 43 bank customers depositing a check, 18 received some cash back. (a) Construct a 90% confidence interval for the proportion of all depositors
Confidence intervals for the proportion of each color as well as the mean total number of candies per bag. You will use the methods of 6.3 for the proportion
A researcher conducts a two tailed two sample t test on 28 subjects (14 subjects in each Group) and finds that t=1.986.
Confidence Intervals: A confidence interval is simply a finite interval of score values on the dependent variable
A large supermarket conducted a consumer preference study by recording the brand of wheat bread pruchased by customers in its stores.
Confidence intervals are used to help you get a better feel for your estimated value. Confidence intervals are like nets
[DESCRIPTIVE STATISTICS: The following unsorted data shows the number of traffic tickets given each day by Deputy Fife over the last eleven days
Julie is an industrial psychologist. She is currently studying stress among executives of health corporations.
The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 100 hours.
Calculate the mean, median and standard deviation of the following data:
The mean replacement time for a random sample of 12 microwave ovens is 8.6 years with a standard deviation of 4.2 years.
Purchase Amounts for all Customers Shopping at a Local Supermarket on a Given Friday
A machine produces 3-inch nails. A sample of 10 nails was selected and the lengths determined. The results are as follows: 2.89 2.95 3.00 3.05 2.99 2.96 3.10
The director of admissions has had questions from potential freshmen regarding the average price of textbooks per semester
Out of a sample of 459 randomly selected light bulbs tested in a laboratory, 291 lasted more than 500 hours
You are a travel agent and wish to estimate, with 95% confidence, the proportion of vacationers who plan to travel outside the United States in the next 12
As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 220 applicants 14 failed the test
An election poll reported that a candidate had an approval rating of 30% with a margin of error E of 4%. Construct a confidence interval for the proportion
In a random sample of six microwave ovens, the mean repair cost was $90.00 and the standard deviation was $11.00. Assume the variable is normally distributed
Find the indicated probability or percentage for the normally distributed variable.
An experimental egg farm is raising chickens to produce low cholesterol eggs. A lab tested 16 randomly selected egg
The new Twinkle bulb is being developed to last more than 1000 hours. A random sample of 100 of these new bulbs is selected from the production line.
Find the level of confidence assigned to an interval estimate of the mean formed using the interval: x - 1.96·sx to x + 1.96·s x .
Measure minutes to and from work versus the time of day I leave. The objective is to find the time of the day that takes the least amount of time