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International Trucking last year sold 20% of their trucks in the Far East, 40% in Europe, 30 in Canada, and 6 in the United State. At level of significance 0.05, test whether the distribution of sales has changed from last year.
A veterinary nutritionist developed a diet for overweight dogs. The total volume of food consumed remains the same, but one-half of the dog food is replaced with a low-calorie "filler" such as canned green beans.
The number of passengers on the Carnival Sensation during one-week cruises in the Caribbean follows the normal distribution.
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
In regards to the statistics paper you helped me with. Can you do a conclusion of the findings. I can edit it to my communication style, but I do need to do the following:
The one-sample t statistic has the value t = -1.68. What do we know about the P -value of this test?
A food snack manufacaturer samples 11 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 15.2 oz. and the sample standard deviation is 0.40 oz., find the 95% confidence interval of the true mean.
Construct a 90% confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of plus or minus .03 grams with a 90% confidence?
A data source generates hexadecimal characters. Let X be the integer value corresponding to a hex character. Suppose that the four binary digits in the character are independent and each is equally likely to be 0 or 1.
Borst et.al. investigated the relation of ego development, age, gender, and diagnosis to suicidality among adolescent psychiatric inpatients.
Suppose that 1 out of 500 infant's are born with Down's Syndrome.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Answer all of these questions using R Commander. Include all graphs, outputs from R Commander.
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