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1. In a random sample of 20 sports drinks, the mean number of calories per serving was 88 with a standard deviation of 10 calories. Assuming the number of calories is normally distributed, construct a 99% CI for the population mean number of calories.
2. The GPAs of 8 randomly selected college students are given below.
3.3 3.5 4.0 2.8 3.1 2.5 2.6 3.9
Assume the population of GPAs is normally distributed. Construct a 95% CI for the population mean GPA.
3. In a survey of 1050 U.S. adults, 588 said that chocolate was their favorite ice cream flavor. Construct a 95% CI for the population proportion of U.S. adults who say chocolate is their favorite ice cream flavor.
a box of 10 gloves contains three left-handed gloves and seven right-handed gloves. complete parts a through d.a. if
Random digits. The table of random digits (Table A) was produced by a random mechanism that gives each digit probability 0.1 of being a 0.
A parking garage in Memphis monitors the time it takes customers to exit the parking structure from the time they get in their car.
A study seeks to compare hospitals based on the performance of their intensive care units. The dependent variable is the mortality ratio, the ratio of the number of deaths over the predicted number of deaths based on the condition of the patients.
The daily demand for rice at a departmental store in thousands of kilogram is found to follow gamma distribution with shape parameter 3 and scale parameter 1/z.
As our sample size increases, what's the expected shape of the samples distribution?- What's the expected value of our sample's mean? Does the size of the sample matter?
Confidence intervals, significance, and effect size. Zou (2007) noted in an article that confidence intervals "encompass significance tests.
Inferences concerning a single parameter b1 in a multiple regression model with 5 predictors and 25 observations based on a standardized variable T
Suppose that units arrive at a server according to a Poisson process at rate D (see Exercise 2.3.18) Let T be the amount of time until the first call.
Let Z1, Z2,... be iid random variables with density f . Suppose that P(Zi > 0) = 1 and that λ = limx↓0 f (x) > 0. Let Xn = n min{Z1,..., Zn}. Show that Xn """ Z where Z has an exponential distribution with mean 1/λ.
question two sample test of hypothesis- unpaired test of hypothesis t-testgender discrimination? your firm is
The economic and market position of the pipelines has been described as mature and stable with little likelihood of significant growth in the near future. Do you agree? Why or why not?
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