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    Hypothesis Testing

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    Inferences About Two Proportions

    A total of 61,647 people responded to an Elle/ MSNBC.com survey. It was reported that 50% of the respondents were women and 50% men. Of the women, 27% said that female bosses are harshly critical; of the men 25% said that female bosses are harshly critical. With this sample data with a 0.05 significance level to test the cla

    Inferences about Two Proportions

    Are Seat Belts Effective? A simple random sample of front-seat occupants involved in car crashes is obtained. Among 2823 occupants not wearing seat belts, 31 were killed. Among 7765 occupants wearing seat belts, 16 were killed. Use this data with a 0.05 significance level to test the claim that the fatality rate is higher for


    1. Assume that you plan to use a significance level of α = 0.05 to test the claim that p1 = p2, Use the given sample sizes and numbers of successes to find the P-value for the hypothesis test. n1 = 100 n2 = 140 x1 = 41 x2 = 35 a. 0.4211 b. 0.0021 c. 0.0512 d. 0.0086 2. Construct the indicate

    Test a Claim About a Mean for weight loss: Sigma Not Known

    Is the Diet Practical? When 40 people used the Weight Watchers Diet for one year, their mean weight loss was 3.0 lb and the standard deviation was 4.9 lb. Use a 0.01 significance level to test the claim that the mean weight loss is greater than 0 lb. Based on these results, does the diet appear to be effective? Does the diet app

    Hypothesis t testing problems

    Question #1 / 9 The mean SAT score in mathematics is . The founders of a nationwide SAT preparation course claim that graduates of the course score higher, on average, than the national mean. Suppose that the founders of the course want to carry out a hypothesis test to see if their claim has merit. State the null hypothesis

    conclusion about statistical significance

    In Exercise 23-26, form a conclusion about statistical significance. Do not make any formal calculations. Either use results provided or make subjective judgments about the results. 24. Mendel's Genetics Experiment One of Gregor Mendel's famous hybridization experiments with peas yielded 580 offsprings with 152 of those peas


    14. Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking-even if they are not exposed to the usual pattern of sunlight. To test this notion, eight paid volunteers were placed (indiv

    Hypothesis Testing of Mean: FICO credit rating scores

    See attached file. Data set attached includes a simple random sample of FICO credit rating scores. As of this writing, the Mean FICO score was reported to be 678. Use a 0.05 significance level to test the claim that the sample of FICO scores comes from a population with a mean equal to 678. H0: H1: Test Statistic [S

    Test a Claim about a Proportion in a stem cell survey

    Stem Cell Survey - Adults were randomly selected for a Newsweek poll. They were asked if they "favor or oppose using federal tax dollars to fund medical research using stem cells obtained from human embryos." Of those polled, 481 were in favor, 401 were opposed, and 120 were unsure. A politician claims that people don't really u

    Statistics: Testing a Claim About a Proportion of arrests

    Percentage of arrests - A survey of 750 people aged 14 or older showed that 35 of them were arrested within the last year. Minitab was used to test the claim that fewer than 5% of people aged 14 or older were arrested within the last year. Use the results from the Minitab display and use a 0.01 significance level to test the sta

    Cans of regular and diet Coke have the same mean weight

    See attached file for complete formulas. 2. Below is the summary information for the weights (in pounds) of regular Coke and diet Coke cans. Test the claim that cans of regular Coke and diet Coke have the same mean weight at a 0.01 level of significance. Regular Coke Diet Coke n1=36 n2=36 s1=0.007507 s2=0.0004391

    Reversal - Null and Alternative Hypotheses

    1. In the 2000 football season, 247 plays were reviewed by officials using instant video replays, and 83 of them resulted in reversal of the original call. In the 2001 football season, 258 plays were reviewed and 89 of them were reversed. Test the claim that the proportion of plays reversed is different for the 2000 and 2001 s

    Statistics Hypothesis Testing & One sample tests

    See attachment for complete problems. Week 1: Quiz: Hypothesis Testing & One sample tests Due on March 8, 2010 in your Individual Forum Directions: For the following one-sample tests, identify the null and alternative hypothesis, and the critical value. Then, calculate the test statistic, note the p value and make a deci

    Hypothesis Testing problems

    13. For each of the following: (a) State which two populations are being compared (b) State the research hypothesis (c) State the null hypothesis (d) Say whether you should use a one-tailed or two-tailed test and why. i. In an experiment, people are told to solve a problem by focusing on the details. Is the speed of

    Statistics Null hypothesis: 20% of Pennsylvania households make more than $70,000

    An economic researcher would like to know whether he can reject the null hypothesis at the 0.10 level, that no more than 20% of the households in Pennsylvania make more than $70,000 per year. a. If 200 Pennsylvania households are chosen at random, how many of them would have to be earning more than $70,000 per year for the r

    Stating Conclusions about Claims

    In these questions we have to make a decision about the given claim. For example, if the claim is that a coin favors heads and sample results consists of 11 heads in 20 flips, conclude that there is not sufficient enough evidence to support the claim that the coin favors heads. 6) Claim: The proportion of households with tele

    Null hypothesis and Alternative hypothesis

    You work at a hospital that has always had about 100 emloyees staffed at night. You think that the number of employees staffed at night has recently decreased and would like to test this claim. If you run a hypothesis test, which of the following statements would fit your problem? a) you have a two tail test. b) your alter

    Life Expectancy and Literacy Rate: Comparing Results Example

    See attached data set file. Do countries where the life expectancy is 65 years and older have a higher literacy rate? Describe the results of your test, and explain how the findings from this hypothesis testing can be used to answer your research question. Be sure to include your raw data tables and the results of the comp

    Hypothesis Testing and Rejection Region: Horse Example

    Is there a significant difference between the lengths of front and rear legs of a certain breed of horses. The results of the measurements in inches made in 10 of these animals are: No. of copies 1 2 3 4 5 6 7 8 9 10 Long. Foreleg 138 136 147 139 143 141 143 145 136 146 Long. Hind l

    Hypothesis testing: Double negative logic, five step process

    Can someone explain this material to me in simple terms? (1) Explain the double-negative logic of hypothesis testing (eg: a scientist fails to reject the null hypothesis). (2) What is the five-step process for hypothesis testing? Is the order important? Why or why not?

    Statistics tests with conclusions: Florida lot price; Microsoft Outlook users

    Problem 6 The Chamber of Commerce of a Florida community advertises that area residential property is available at a mean cost of $25,000 or less per lot. As a part-time resident, you believe this to be an untrue statement and you seek to test the validity of this claim at the .05 level of significance. You collect a sample o

    Upper and Lower Control Limits for Testing

    The yield strength of a metal bolt has a mean of 6,050 pounds with a standard deviation of 100 pounds. Twenty samples of three bolts were tested, resulting in the means shown below. (a) Construct upper and lower control limits for the¯ x chart, using the given product parameters. (b) Plot the data on the control chart. (

    ANOVA: Apple juice concentrate

    See attached file. An apple juice manufacturer develops a new juice concentrate. This new product is a) more convenient, b) higher in quality, and c) less expensive than conventional apple juice. The marketing manager needs to decide whether advertising should stress convenience, quality, or price. A pilot study is done in th

    Interpretations of P value

    (a) A statistical study reported that a drug was effective with a p-value of .042. Explain in words what this tells you. (b) How would that compare to a drug that had a p-value of .087?