Statistics

posted by .

A private opinion poll is conducted for a politician favors decriminalizing marijuana possession. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 2%.

  • Statistics -

    Formula to find sample size:
    n = [(z-value)^2 * p * q]/E^2
    ... where n = sample size, z-value is found using a z-table for 95% confidence, p = .5 (when no value is stated in the problem), q = 1 - p, ^2 means squared, * means to multiply, and E = .02.

    Plug values into the formula and calculate n.

    I hope this will help get you started.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Stats

    Time/CNN voter polls monitored public opinion for the presidential candidates during the 2000 presidential election campaign. One Time/CNN poll conducted by Yankelovich Partners, Inc., used a sample of n = 589 likely voters (Time, …
  2. Stats

    A manufacturer of golf equipment wishes to estimate the number of left-handed golfers. How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 2%?
  3. Statistics

    The Academy of Orthopedic Surgeons states that 80% of women wear shoes that are too small for their feet. A researcher wants to be 98% confident that this proportion is within 3% of the true proportion. How large a sample is necessary?
  4. statistics

    A researcher at a major hospital wishes to estimate the proportion of the adult population of the U.S. that has high blood pressure. How large a sample is needed in order to be 99% confident that the sample proportion will not differ …
  5. statics

    A manufacturer of golf equipment wishes to estimate the number of left-handed golfers. How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 2%?
  6. Stat Help

    A researcher wishes to be 95% confident that her estimate of the true proportion of individuals who travel overseas is within 4% if the true proportion. Find the sample necessary if in a prior study, a sample of 200 people showed that …
  7. Math

    Suppose that 20% of the residents in a certain state support an increase in the property tax. An opinion poll will randomly sample 400 state residents and will then compute the proportion in the sample that support a property tax increase. …
  8. statistics

    a private opinion poll is conducted for a politician to determine why proportion of the population favors decriminalizing marijuana possession. how large a sample is needed in order to be 90 percent confident that the sample proportion …
  9. mpc

    A reasearcher wishes to be 95% confident that her estimate of the proportion of two individuals who travel over sea is within 4% of the true proportion. Find the sample necessary if in a prior study a sample of 200 people showed that …
  10. stat

    A researcher at a major clinic wishes to estimate the proportion of the adult population of the US that has sleep deprivation. How large a sample is needed in order to be a 95% confident that the sample proportion will not differ from …

More Similar Questions