one sample z test example

If two samples have means of 24 and 28 and standard deviations of 4 and 6, with 12 and 15 as the sizes, find the z score for difference of two population means. => 2.07 or 7.73 or 1.07 or 1.93..

A manufacturer claims that the mean content of soft drink in bottles is 300 ml. The contents vary normally with standard deviation σ = 4 ml. A sample of 40 bottles are randomly selected and tested. A 5% significance test rejects H 0 if z ≤ - 1..

A survey reported that 64% of the children of 12 to 15 years of age play online games. In a sample of 200 of this age group, 150 responded positively. Test the survey report at α = 0.01. => z = 3.24, there is enough evidence to reject the survey report or zh..

An experiment repeated under essentially homogeneous and similar conditions results in an outcome, which is unique or not unique but may be one of the several possible outcomes. When the result is unique then the experiment is called a 'deterministic' experime..

An experiment repeated under essentially homogeneous and similar conditions results in an outcome, which is unique or not unique but may be one of the several possible outcomes. When the result is unique then the experiment is called a deterministic experiment . Any experim..

Overview of methods of data collection: Census Sample survey Experiment Observational study Planning and conducting surveys: Characteristics of a well-designed and well-conducted survey Populations, samples, and random selection Sources of bias in s..

In a random sample of 180 American home owners, it was found that 158 of them personaly attend to their yard or garden duties. Test the hypothesis that more than 80% of the American home owners personally work in their yard or garden at α = 0.01. Use the p -value method. W..

Which of the statement(s) is not the property of t distribution which differentiates it from the standard normal or z distribution? => The distribution shares the bell curve of the z , but reflects the variablility that is inherent with smaller sample sizes. or As the ..

Solve the system using Cramer's rule x - y + 6 = - z y + 1 = -z x + 1 = z => (- 2, 2, - 2) or (- 3, 1, - 2) or (- 4, - 1, - 3) or (1, 3, - 4)..

In a batch of 5,000 wrist watches, there are on an average 10 defective ones. If a random sample of 500 is selected, then what is the probability of two defective ones? => 0.27 or 0.36 or 0.184 or 1.35..