Variables Graphs Measurement scales Nominal Ordinal Interval Ratio Qualitative Quantitative Independent Dependent Bar Graph Histogram Box plot Scatterplot Measures of Center Spread Shape Mean Median Mode Range Variance Standard deviation Skewness Kurtosis Tests of Association Inference Correlation Regression Slope y-intercept Central Limit Theorem Chi-Square t-test Independent samples Correlated samples Analysis-of-Variance Glossary of Terms
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An experiment investigating the effects of interference on speed estimates during the Stroop task Nicharee Thamsirisup (Nid) IB Psychology Standard Level Abstract: This experiment is to investigate the effect of color interference in speed estimates of the Stroop task which was first researched by John Ridley Stroop in 1935. This can be investigated by seeing the time difference between the task of identifying colors when color words are printed in the same color as their semantic meaning
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of the water and the standard deviation. Converting minutes to seconds: The average time taken (seconds) for the disc to resurface and float on the surface of the water: Standard Deviation: (Graphic Calculator) 1. Press STAT 2. Press 1: Edit 3. Put in the data for time taken in seconds at distance of 10cm away from lamp into L1 4. Press STAT 5. Press > to go into CALC 6. Press 1: 1-Var Stats and ENTER 7. Sx: 37.89 Standard Deviation = 37.89 Graph
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Location Location Income ($1000) Size Years Credit Balance($) Urban 1 54 3 12 4016 Rural 3 30 2 12 3159 Suburban 2 32 4 17 5100 Suburban 2 50 5 14 4742 Rural 3 31 2 4 1864 Urban 1 55 2 9 4070 Rural 3 37 1 20 2731 Urban 1 40 2 7 3348 Suburban 2 66 4 10 4764 Urban 1 51 3 16 4110 Urban 1 25 3 11 4208 Urban 1 48 4 16 4219 Rural 3 27 1 19 2477 Rural 3 33 2 12 2514 Urban 1 65 3 12 4214 Suburban 2 63 4 13 4965 Urban 1 42 6 15 4412 Urban 1 21 2 18 2448 Rural 3 44 1 7 2995 Urban 1 37 5
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confidence intervals for proportions Chong Chun Wie Ext: 2768 ChongChunWie@imu.edu.my Content • Sampling distribution of sample means (SDSM) • Normality Test • Estimating a population mean: σ known • Estimating a population mean: σ unknown • Standard deviation of proportion • Confidence interval of proportion • Hypothesis testing with proportion Population and Sample Samples Populations Sampling distribution of sample means (SDSM) Sampling distribution • Example – Select randomly from the
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voluntary response bias d) placebo 2. (13 points) The frequency table below summaries the horsepower of 50 cars. Horsepower Frequency 80 7 90 13 100 12 110 7 120 4 130 3 140 2 150 1 160 0 170 1 a) Construct a histogram. b) Find the mean‚ median‚ standard deviation‚ and IQR. c) Describe the distribution’s shape‚ center‚ and spread. Justify your answer. d) Add a column to the table for relative frequency. e) Add another column to the table for cumulative relative frequency. f) What is the 86th percentile
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be (4.20‚ 7.00). The margin of error then must be (A) 5.60 (B) 2.80 (C) 11.20 (D) 1.40 2. _____ The number of days between receipt of an order and shipment of goods for in-stock items is normally distributed with a mean of 3.0 days and a standard deviation of 0.5 days. For a randomly selected order‚ the probability that the receipt-to-order delay time is more than 4 days is (A) 0.1269 (B) 0.0228 (C) 0.0583 (D) 0.1557 3. _____ For the same situation as in Question #2 above‚ the probability that
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(RM) Revenue Allocation (%) Food Utilities Transportation Education Recreation Others Total 100% Based on the table above‚ (i) Represent your data using three different statistical graphs. (ii) Calculate the mean and standard deviation for the allocation of income to use at least two methods. Give your comment. SECTION B (i) Collect data from the 5 friends and record your findings in Table 1. (ii) Compare and comment on your findings. (iii) Draw on the same axis‚
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sier!™ ing Everything Ea Mak ta t i s t i c s S e nt ia l s Ess Learn: • Exactly what you need to know about statistical ideas and techniques • The “must-know” formulas and calculations • Core topics in quick‚ focused lessons Deborah Rumsey‚ PhD Auxiliary Professor and Statistics Education Specialist‚ The Ohio State University Statistics Essentials FOR DUMmIES ‰ by Deborah Rumsey‚ PhD Statistics Essentials For Dummies® Published by Wiley Publishing‚ Inc. 111 River St
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NCAA football coaches has a mean of $415‚953 and a standard deviation of $463‚364. Construct a 95% confidence interval estimate of the mean salary of an NCAA football coach. In a study designed to test the effectiveness of acupuncture for treating migraine‚ 142 subjects were treated with acupuncture and 80 subjects were given a sham treatment. The numbers of migraine attacks for the acupuncture treatment group had a mean of 1.8 and a standard deviation of 1.4. The numbers of migraine attacks for the
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