population mean

  1. A

    Is the mean of a kernel density estimator a valid estimator of the population mean?

    Say you have an independent sample X_1, X_2, ..., X_n drawn from some population where each X_i have the same univariate density f(x). You estimate this density function using a non-parametric kernel density estimator f_kde(x). My question is that since, f_kde(x) is an estimate of f(x), can you...
  2. A

    How to compare population distribution?

    I have census data for three cities (i.e. population, not sample data). I am able to plot a histogram (discrete data) for population age for each of these cities. I want to run a statistical test to check if the difference between the three population distributions and their mean value are...
  3. A

    How to find the probability of a sampling error made in estimating the population mean?

    Alright, I have been working on my statistics assignment since Monday and I only have two questions left, dealing with the probability of a sampling error. Unfortunately, I cannot find anything in my notes and only a brief example in my textbook that does not explain the concepts behind the...
  4. I

    How would you enter this data?

    I have to do a t-test (it doesn't say which type of t-test) in SPSS about the olfactory scores of smokers and non-smokers. For smokers, we are given the scores so I know how to enter that in SPSS. For non-smokers, we are not given the scores, it simply says “On a test of olfactory sensitivity...
  5. N

    NCE: how to find population mean/variance/standard error

    I have been given a homework problem with NCE with an average score of 100, and individual's score of 130. Can anyone guide me to a resource that will help me figure the sample mean, SD, Sample variance, population mean, standard deviation of population, population variance, and standard...
  6. E

    Confidence Interval

    In 22 patients with an unusual liver disease, the plasma alkaline phosphatase had a mean value of 39 IU/l (International Units per liter), standard deviation = 3.4 IU/l. Calculate the 95% confidence interval for the population’s true mean value of plasma alkaline phosphatase. My equation...
  7. B

    Population Mean, Population Standard Deviation, and z-scores

    Hello! My stats teacher gave me a problem with a list of 20 numbers: 1000, 1290, 1290, 1200, 1460, 1410, 1320, 1300, 1290, 1150, 1300, 1600, 1080, 1360, 1110, 940, 1200, 1430, 1410, 1060 She then told us to find the population mean and the population standard deviation so that we could...
  8. H

    Sample distribution of means and the minimum number of samples/population size

    Hi, Im having some issues with 2 things, and would appreciate it if someone could clear things up. (1) Ive read that the mean of "the sampling distribution of means" is the same as the "populations" mean. To construct the sampling distribution of means, i need to take X * number of...
  9. J

    Percentage of data points in distribution

    Hello, I have a sample of data for which I have figured out that the population mean for the height of US 12-year-old children is μ = 150 cm with σ = 6 cm. The heights are normally distributed. I now need to figure out the percentage of children have heights between 141 and 159 cm. Any help is...