Does emotional intelligence change across the lifespan? A researcher conducts a longitudinal study by collecting data on the same people across 20 years. Emotional intelligence was quantified at ages 4, 14, 24, and 34 years of age. Emotional intelligence was quantified using the self-report Bar-On EQ-I, which ranges from 0 â€" 110, and is considered "scale" in nature. Assume data meets all assumptions for a parametric test. Question: What is the independent variable in this scenario? Four-year old children Age Emotional intelligence Biological sex

(d) What type of error might we have made? Explain what the error means in the context of the application. (e) Based on the results of this hypothesis test, would you expect a confidence interval for the average difference between the reading and writing scores to include 0? Explain your reasoning.

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You may need to use the appropriate appendix table or technology to answer this question. In a study entitled How Undergraduate Students Use Credit Cards, it was reported that undergraduate students have a mean credit card balance of $3,173. This figure was an all-time high and had increased 44% over the previous five years. Assume that a current study is being conducted to determine if it can be concluded that the mean credit card balance for undergraduate students has continued to increase compared to the original report. Based on previous studies, use a population standard deviation  ? = $1,000. (a) State the null and alternative hypotheses. H0: ? < 3,173 Ha: ? ≥ 3,173 H0: ? = 3,173 Ha: ? ≠ 3,173      H0: ? > 3,173 Ha: ? ≤ 3,173 H0: ? ≥ 3,173 Ha: ? < 3,173 H0: ? ≤ 3,173 Ha: ? > 3,173 (b) What is the test statistic for a sample of 170 undergraduate students with a sample mean credit card balance of $3,305? (Round your answer to two decimal places.)   What is…