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Question: Average soap consumption in a certain country is believed to be 2.5 bars per person per month. The standard deviation of the population is known to be σ = 0.8. While the standard deviation is not believed to have changed (and this may be substantiated by several studies), the mean consumption may have changed either upward or downward. A survey is therefore undertaken to test the null hypothesis that average soap consumption is still 2.5 bars per person per month versus the alternative that it is not. A sample of size n = 20 is collected and gives x¯ = 2.3. The population is assumed to be normally distributed. What is the appropriate test statistic in this case? Conduct the test and state your conclusion. Use α = 0.05. Does the choice of level of significance change your conclusion? Explain.
The input to a linear filter is a random process. - The impulse response of the filter is of the same form - Determine the autocorrelation function of the filter output.
A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster.
professor fair believes extra time does not improve grades on exams. he randomly divided a group of 300 students into
Investigate the relationship between the outcome, number of com- plaints per visit, and each of two continuous explanatory factors, revenue (dollars per hour) and workload at the emergency service (hours), by calculating Pearson's correlation coef..
q1. a pistachio rancher buys a new fertilizer system that is supposed to increase the yield per acre. she uses
The following table provides the weight in grams of a sample of 50 bags produced in one hour by a single machine: Compute the arithmetic mean and median.
attention deficient hyperactivity disorder adhd is a diagnosis applied to children who exhibit the following behaviors
1. Data for the "plasters" experiment undertaken in week 2 (7/10/14) are available on Moodle. Eliminate one of the rows of data (i.e. one plaster type for one person) at random and specify in your response which one was removed.
Entire commercial airline industry, consider a random sample of 200 flights. What is the expected number that will arrive on time? What is the standard deviation of this distribution.
All numbers are in thousands of dollars per year.- Conduct the test at α = 0.05, and evaluate the effectiveness of the programs in terms of increased average salary levels.
the mean salary for the clearing department at ameriprise financial is 42000.00 with a standard deviation of 8000.00.
a manufacturer knows that their items have a normally distributed lifespan with a mean of 3.1 years and standard
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