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BMI in children is roughtl normally distributed with the mean of 24.5 and standard deviation of 6.2.
a) BMI between 25 and 30 is considered overweight. Determine proportion of children are overweight?b) BMI of 30 or more is considered obese. Determine proportion of children are obese?c) In the random sample of 10 children, determine the probability that their mean BMI exceeds 25?
The manager is concerned that sales are slipping, after taking into account the average value of sales for four consecutive Saturdays being $4800.
Which statement is true for a statistical study?
Critically discuss the assumptions, if any, regarding a Chi-square test? What are the assumptions to apply linear regression?
Find the value of q-hat from proportion and degrees of freedom used to find the t-score.
A random sample of 36 drinks from a soft drink machine has an average content 7.6 ounces with an standard deviation of 0.48 ounces. Test the hypothesis ounces against the alternative hypothesis at the 0.05 level of significance.
The director for training at a company that manufactures electronic equipment is interested in determining whether different training methods have an effect on the productivity of assembly line employees.
Lewis earned 85 on his biology midterm and 81 on his history midterm. In the biology class the mean score was 79 with standard deviation 5.
Perform a significance test to see if there is a relation between mortality and duration of employment in the group hired AFTER 1945 and report a p-value.
Use the 5% level of significance. (a) Define null and alternate hypotheses. (b) Determine the value of sample test statistic? (c) Determine(or estimate) P-value.
What is the chi-square goodness of a fit test? What is its purpose? What does it measure? Is there a way of telling when the test is over?
Suppose it is known that if you offer free samples o a product, at least 52% of adults are more likely to buy the product. You interview a random sample of 50 adults.
Is there a significant difference between the scores between the Republicans and the Democrats?
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