• Q : Difference in the mean number of times men....
    Basic Statistics :

    At the .01 Significance level, is there a difference in the mean number of times men and women send a twitter message in a day? What is the value of the test statistic for the bypothesis test?

  • Q : Mean speed that drivers drive....
    Basic Statistics :

    NJ State Partol would like to know if the mean speed that drivers drive in I-80 is faster than I-280. They gather following sample information and ask students to investigate this matter using .05 s

  • Q : Unit-variance gaussian random variable....
    Basic Statistics :

    The output Y of a binary communication channel is a unit-variance gaussian random variable with mean zero when the input is 0 and mean one when the input is 1. Assume that the input is 1 with probab

  • Q : Tossing four coins and counting....
    Basic Statistics :

    500 trials where each trial consists of tossing four coins and counting the number of heads. Find the number of cases in which exactly 3 heads turned up. Based on that result, what is the empirical

  • Q : Difference in the proportions of female....
    Basic Statistics :

    A university wants to know whether there is a difference in the proportions of female and male students in a two different classes. samples are colleceted from each class,

  • Q : Question in probability notation....
    Basic Statistics :

    State the information given in the question in probability notation. What is the probability a traveller can get from A to B?

  • Q : Average error rate of typo....
    Basic Statistics :

    Horace Hadley has just programmed a superb OCR package called Read-right (pun unintended) that has an average error rate of 1 typo in every 500 characters. This is great by today's standards. A page

  • Q : Mean number of units of local anesthetic....
    Basic Statistics :

    Consider a random sample of 100 dentists, and let x represent the mean number of units of local anesthetic used per week for the sample.

  • Q : Sampling plan result in a random sample....
    Basic Statistics :

    ABC News conducts an election day poll by randomly selecting voting precincts in New York, then interviewing all voters as they leave those precincts. a. Does this sampling plan result in a random s

  • Q : Find the probability that the card....
    Basic Statistics :

    A card is drawn from a standard deck of 52 playing cards. a.) Find the probability that the card is an ace or a king. b.) the card is an ace or a black card.

  • Q : Find the probability of answering....
    Basic Statistics :

    Find the probability of answering the 2 multiple choice questions correctly if random guesses are made. Assume the questions each have 5 choices for the answer. only 1 of the choices is correct.

  • Q : Considering a budget proposal....
    Basic Statistics :

    The local county is considering a budget proposal that would reallocate funding to renovate the city pools. A survey is conducted to measure public opinion of the proposal.

  • Q : What is the critical value....
    Basic Statistics :

    It is claimed that in a bushel of peaches, less than ten percent are defective. A sample of 400 peaches is examined and 50 are found to be defective. What is the critical value for a = 0.025?

  • Q : Alternate hypothesis for a one-sided test....
    Basic Statistics :

    It is claimed that in a bushel of peaches, less than ten percent are defective. A sample of 400 peaches is examined and 50 are found to be defective. What is the alternate hypothesis for a one-sided

  • Q : Increased from a sample....
    Basic Statistics :

    She calculates a power of 0.43 for that increased from a sample of 150 customers. Explain to her why she should consider a larger sample size.

  • Q : Probability of randomly sampling....
    Basic Statistics :

    1. For a population that is normally distributed with a mean of 100 and standard deviation of 10, what value would separate the smallest 20% of values from the next larger 80% of values?

  • Q : Density function for a series of processes....
    Basic Statistics :

    The density function for a series of processes is fX (x) = 3/2x^2 for ?1 < x < 1. Choose 10 numbers independently from this distribution and find P(at least one is more than .5)

  • Q : Interdisciplinary task force....
    Basic Statistics :

    An engineering department consists of15 electrical, 15 chemical, 15 industrial, and 15 civil engineers. An interdisciplinary task force of 10 people will be formed from this department.

  • Q : Confidence interval estimate of population proportion....
    Basic Statistics :

    Of 900 customers surveyed, 414 said they were very enthusiastic about a new home décor scheme. Construct a 99 percent confidence interval estimate of the population proportion. Interpret your

  • Q : Restaurant marketing campaign....
    Basic Statistics :

    To help your restaurant marketing campaign target the right age levels, you want to find out if there is a statistically significant difference between the mean age of your customers and the age of

  • Q : Four-group experiement....
    Basic Statistics :

    A researcher comuted the F ratio for a four-group experiement. The computed F is 4.86. The degrees of freedom are 3 for the numerator and 16 for the denominator

  • Q : Density-mean and variance....
    Basic Statistics :

    find the density, mean, and variance for X. find the reliability function for x. what is the reliability of these lights at 5000 miles? At 10,000 miles?

  • Q : Withstand a major storm....
    Basic Statistics :

    There chance of the condo not being able to withstand a major storm is .008 and because there is a storm every year, the condo will endure 25 storms during the mortgage. .008 * 25 = .2, meaning ther

  • Q : What happens to the the reliability....
    Basic Statistics :

    If a normally distributed force having a mean of 180lb and standard deviation of 30 lb is applied, what is the static reliability? As the variability ( variance) of either the strength or load incre

  • Q : Mean and standard deviation for the distribution....
    Basic Statistics :

    For number 5 above, what is the mean and standard deviation for the distribution you have generated. Give units. Describe how the graph you generated for number 4 above would change if the probabilit

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