# Confidence interval

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The majority of the respondents were single or not married with 84 total. One interesting fact was, the unmarried shoppers were nearly equally satisfied at the Springfield Mall and Downtown. It would be interesting to know the sort of goods that are sold at these two places to see if they had goods that were catered to singles as in a collage town. The Margin of Error Table 6 below depicts managements request for the size of sample required to obtain a 95% confidence with a margin of error of 0.05. Jaggia and Kelly (2014) stated that a confidence interval is generally associated with a margin of error that accounts for the variability of the estimator and the desired level of the interval” (p. 245). As the table shows, the sample size will need to be quite large to contain such a large number of the data. Springfield Mall will need to have the largest sample with 2416 followed by the West mall and Downtown, which need 2085 and 2028…

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experimental conditions and one of the four crime videos. The study also consisted of three phases. In phase one, subjects watched a video of a crime being committed. They were told to play close attention to details in the video. In phase two, subjects worked on three questionnaires and an anagram for at least 8 minutes. Subjects also responded on a 100 point Likert scale from completely uncertain to completely certain. Afterwards, the subjects saw a lineup that had two rows of three pictures.…

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Statistics % Ratio of Data Original Price (\$) Sale Price (\$) No. of Days to Sell (days) Mean = Point Estimate = 108.62 85.24 62.36 Original Price to Sales Price % = 78.48% Original Price to No. of Days to Sale % = 57.41% Data for Beltway Shoes Price of \$125 = 125.00 98.09 71.76 Note: Data was compiled from Colorado State University - Global Campus. (2015). Module 5 – Sampling and Statistical Inference [Critical Thinking file named shoes.xls]. In MTH410 – Quantitative…

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In fact, Anderson et al. (2015), stated that “the value .95 is referred to as the confidence coefficient, and the interval 78.08 to 85.92 is called the 95% confidence interval” (p. 340). This should express that a normal distribution will always follow this rule. Therefore, if one wanted to ensure that home sales were still tracking to normal distribution, a quick calculation would ensure it. If home sales or prices experienced an unusual circumstance, this calculation would allow one to see if…

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method. AJ Davis department store, a chain store, wants to analysis the credit customers so the sample data of 50 credit customers was collected. The manager at the store has speculated some information about credit customers. By using the sample data of 50 credit customers, along with hypothesis testing and confidence intervals, we could determine whether manager’s speculations are convincing. Also, this report provides the summarization on the four variables of interests; income, location,…

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patient-days or as little as 5.88 per 10,000 patient-days. The confidence intervals for the All-states estimate and for the ACT do not overlap, which indicates that there is a difference between the two rates. To check this, I also calculated a rate ratio: The rate ratio for these two incidence rates (blue) indicates that ACT had a 1.83-fold, or 83%, higher rate than for all other states combined. We are 95% confident that the true population rate ratio could be as much as a 2.08-fold…

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period 1 and 2 as well as the number of recaptures in period 2, we were able to estimate the population size for grasshoppers in the two locations. Utilizing a 90% confidence interval allows for the most accurate assessment of the true population size. However, the confidence intervals are quite large which could possibly bias the data. We found that the grasshopper population for the Wednesday site decreased over time, when comparing the 2015 data to data collected in 2012. Whereas the Thursday…

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Group Means with 95% Percentile Bootstrap Confidence Intervals Lower Mean Upper female 3.899 3.988 4.068 male 3.505 3.607 3.700 Group Medians with 95% Percentile Bootstrap Confidence Intervals Lower Median Upper female 4.0 4.082 4.2 male 3.6 3.742 3.8 Group Interquartile Ranges with 95% Percentile Bootstrap Confidence Intervals …

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of evidence that is flawed for the various innocent exonerations. This case better explains this matter especially after DNA tests from Ronald Cotton claimed that he was innocent of the accusations that were mad on him. It was therefore, of no surprise that Cotton spent over ten years in prison, experiencing the pain, trauma and suffering for course that he had not undertaken. Trial records indicate that upon being raped, Jennifer net to the police station where the police helped her in drawing…

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The point estimate of the true mean difference between the lowest detectable amplitudes (post space flight sensitivity – pre-space flight sensitivity) is 33.866 micrometers. This provides evidence that astronauts’ foot sole skin becomes hyposensitive following space shuttle missions. We can be 95% confident that the true mean difference in the lowest detectable amplitude of a 25 Hz frequency on the big toe of an astronaut before and after a space shuttle mission (after-before), under…

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