Question
8.43
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Question
8.44
Sample size, z statistics, and the Consideration of Future Consequences scale: Here are summary data from a z test regarding scores on the Consideration of Future Consequences scale (Petrocelli, 2003): The population mean (μ) is 3.20 and the population standard deviation (σ) is 0.70. Imagine that a sample of students had a mean of 3.45.
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- A/LE6e3lhK6ggvProDx1N6P2mb606Eo+st/GC+wojqJX2JX5SZnvH41zSb4yex3QF37ZFWyhWtdVDKvVeX509OQpIm64BlnedvtF1P4X1SQ2EMFCYP/13X9cgDK27np3XyQE8gV8AGJ04l5SUbUOu4fuitgRGs4OhNuZbVQ9/q/00S28RJzGx53VNBeQGIUOjAp8wumtgMiQDEu+
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Question
8.45
Sample size, z statistics, and the Graded Naming Test: In an exercise in Chapter 7, we asked you to conduct a z test to ascertain whether the Graded Naming Test (GNT) scores for Canadian participants differed from the GNT norms based on adults in England. We also used these data in the How It Works section of this chapter. The mean for a sample of 30 adults in Canada was 17.5. The normative mean for adults in England is 20.4, and we assumed a population standard deviation of 3.2. With 30 participants, the z statistic was −4.97, and we were able to reject the null hypothesis.
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Question
8.46
Cheating with hypothesis testing: Unsavory researchers know that one can cheat with hypothesis testing. That is, they know that a researcher can stack the deck in her or his favor, making it easier to reject the null hypothesis.
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Question
8.47
Overlapping distributions and the LSATs: A Midwestern U.S. university reported that its behavioral science majors tended to outperform its humanities majors on the LSAT standardized test for law school admissions. Sadie, an English major, and Kofi, a sociology major, both just took the LSAT.
- 8EFC9+R8frsGQSgepvg3gahRJNFTrrgFUoqVW3lxVDletu+1/kVJWaWMisbHRjogRNasLrr6WIZl2Gjr3VRea4FSif5NvtDpoamYNeZXQSRwb7RP4/Ke/kgSj3s=
- 5KtqaHWpl31kVdkbq7t69rCQdRKBQ6xYR1p8Kb9z2HXu2ksNRvCebiPOds8vl+nbr8chbUmwAlNQUWvjoLI8eSWgCBV1UD8rchdznUL6W93j+GNeWGlSblox3Raec+9Rd3daf2X100fcf96qetznEwfiH9hS0N1vxpgALsEVsLUWCNdm7LTkpbaocpafhZ+BV5ZLfkkJ256yq2SNq5441lA0dvapzjRZUDfC64ICRqtJXoCizfb2+ZtSsTI5Dqlp6H9/OYf9EIbOXGw5
Question
8.48
Confidence intervals, effect sizes, and tennis serves: Let’s assume the average speed of a serve in men’s tennis is around 135 mph, with a standard deviation of 6.5 mph. Because these statistics are calculated over many years and many players, we will treat them as population parameters. We develop a new training method that will increase arm strength, the force of the tennis swing, and the speed of the serve, we hope. We recruit 9 professional tennis players to use our method. After 6 months, we test the speed of their serves and compute an average of 138 mph.
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- rdw8A0W/ahcNKcWneY9yiQh7WtG2qH8qYJ0ctO4jbKtTdVLZLQWAnM4DT+HhiGcRplEjjqfwsYXfHQ1YYW8UgvITRxljsQkzLcu5syuiDt/cnylLrHzO5SB70CYrRK+h
Question
8.49
Confidence intervals and football wins: In an exercise in Chapter 7, we asked whether college football teams tend to be more likely or less likely to be mismatched in the upper National Collegiate Athletic Association (NCAA) divisions. During one week of a college football season, the population of 53 Football Bowl Subdivision (FBS; formerly Division I-A) games had a mean spread (winning score minus losing score) of 16.189, with a standard deviation of 12.128. We took a sample of four games that were played that week in the next-highest league, the Football Championship Subdivision (FCS; formerly Division I-AA), to see if the spread were different; one of the many leagues within FBS, the Patriot League, played four games that weekend. Their mean was 8.75.
- wjoYEHAHX/VnWKAbf1fBOHbEitfFx0gaEHrpS3BqoivG/pjgmFYpeb53MZGChQP2HMapJP5RkJ+4um7nYc4JsYMqMoiSW5et
- ydrOScpB3OdL772EFoscJ1S9wqMXUNGeKc6C/xxaDfjP3GBj9b2eEcmlH+1VIC4GZqOTwN5KE15UgOi43jyhGcdIKS7CQpArNtMM2yyGtHb4nQ1u
- 613Yc6QgbVY0ZwNN3Cluyl8gqWmol+zRwLgra7dMWMOwRQM99EOsXdxfJhHTYLSpHV0cf0jQAg0QD3HnfOwmFHXXxwqUzNzrEAu+IeLb9yIYwsugiL6p7+H1mKdv+2Y49I6Io0AZiyPSaMUhVp4lYw==
- b/Ptxm/NMff7jEInLutOVi/btozYfEb9LGg008qNTjHVxa0Q7XIKz+hayeiGyC/BoClba3hrf9D8p4v5wi88ebX76cc35MOYsDNLvKeIwUiV6RL19nJ2YKlHKhxb6Qn+gCpbCPdVvvE2NqtDwic7Voz9nwaEfo6ZdTmKIQ==
Question
8.50
Confidence intervals and football wins (continued): Using the football data presented in Exercise 8.49, practice evaluating data using confidence intervals.
- yyri9znsKF3SPoBClctfak1iEg/Xbnjql1V6IlACSK40C8rftAF4KvNAiFkfe6gd6cLSMw==
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Question
8.51
Effect size and football wins: In Exercises 8.49 and 8.50, we considered the study of week 11 of the fall 2006 college football season, during which the population of 53 FBS games had a mean spread (winning score minus losing score) of 16.189, with a standard deviation of 12.128. The sample of four games that were played that week in the next highest league, the FCS, had a mean of 8.75.
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- HBWrxt/IEV6BmHzQWOkTicCqKRESt6r46Mm54L04XPiFH9iLGFDQ/Nm5P943Jovl2j44+tRmfz8CZx/7fAQ12akAYS1B/TNhtUzLRuitX1BuUhInu9jvyVe0514=
- U32EuSvvOAGYgmR7vgkhH2l33NvLjAueiFkwUOocX4BsISmWS+9QVokyc68Sjyn/O5zYFN6faCVvr3LT034zRKfudxF2tAAUzcxoDKSFCyJw0F0scQaeift0g303sJY0ZYyqNam8szkyE53r
Question
8.52
ki3KWjhNPogRwaHKdbfEcM/RGevowaDmreAV1n3HjidAQmTmVayOajHcTBP6Ja2+c4FZN0B1Haez/ULvzDhr+Xff3sOezwvte59GtxDEtJDWMyVWSlcjynZfmLq+fpAEl+4JPUddcJdcafy0AxV7CaT6BPLjv47+Vmhtcg6ceI0TlEB37S4s67ZNNN6ks314JVw5P1hRxzWNtTbLG3WnCnNC8q2Y7sg/kDSkBBCMekYMR55In9VoGZyPWzNEq0j8jG/EUFfK68vupmPiURz7eQj4JEGZrZd060hCi3zv+XmypK+g+kR7k09RK/50fESpVdg39n97HqDXOUSHIZQ/qI76pHwW0tbA06AnPvRDgi52Et3gSAQz8NIZHkk9SunTwVRy0y61PQtsGSgCvFtqahxIoaR3LabR+GemN/CTwAc=
Question
8.53
Confidence intervals, effect sizes, and Valentine’s Day spending: According to the Nielsen Company, Americans spend $345 million on chocolate during the week of Valentine’s Day. Let’s assume that we know the average married person spends $45, with a population standard deviation of $16. In February 2009, the U.S. economy was in the throes of a recession. Comparing data for Valentine’s Day spending in 2009 with what is generally expected might give us some indication of the attitudes during the recession.
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- erc4OnjctPSijnA2ydorXSfaPjAW6ewsfQPciH1HS58tO21hPcp1vgP2ozgsxMG6x2/Byv1p+s4g8Ky1NUCcVudj2J/JvIdJv+78FiQZZq3FHJLH06N0lB0m3S6bM2QN
Question
8.54
More about confidence intervals, effect sizes, and tennis serves: Let’s assume the average speed of a serve in women’s tennis is around 118 mph, with a standard deviation of 12 mph. We recruit 100 amateur tennis players to use our method this time, and after 6 months we calculate a group mean of 123 mph.
- eaDgnRGhbLrfx9FNTavlhAXMPmJwV3vwx3bUGCDVZGh8Cj2UChUyaw01lKi0sOJV591bbN443W39Ll2hzvNOnYBCXPfLVbylPWuX/Zj4wZ9Dj+0t+CQsDIpKLl/A+r03qXG8AhhBqpY=
- mWQggKDFvpFjryKIABXazFOtmm5AoA9FhZ3yw5TlXWi0ypLrUz4Ps3BohrIC7g9UYJK5EsABU6JeKvbyrtn1ahtoqIA=
Question
8.55
Confidence intervals, effect sizes, and tennis serves (continued): As in the previous exercise, assume the average speed of a serve in women’s tennis is around 118 mph, with a standard deviation of 12 mph. But now we recruit only 26 amateur tennis players to use our method. Again, after 6 months we calculate a group mean of 123 mph.
- eaDgnRGhbLrfx9FNTavlhAXMPmJwV3vwx3bUGCDVZGh8Cj2UChUyaw01lKi0sOJV591bbN443W39Ll2hzvNOnYBCXPfLVbylPWuX/Zj4wZ9Dj+0t+CQsDIpKLl/A+r03qXG8AhhBqpY=
- mWQggKDFvpFjryKIABXazFOtmm5AoA9FhZ3yw5TlXWi0ypLrUz4Ps3BohrIC7g9UYJK5EsABU6JeKvbyrtn1ahtoqIA=
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Question
8.56
In several exercises in this chapter, we considered the study of week 11 of the fall 2006 college football season, during which the population of 53 FBS games had a mean spread (winning score minus losing score) of 16.189, with a standard deviation of 12.128. The sample of four games that were played that week in the next-highest league, the FCS, had a mean of 8.75.
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Question
8.57
Calculate statistical power based on the data presented in Exercise 8.55 using the following alpha levels in a one-tailed test:
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- KmdLoPuSeiCjrwsZ0x5nWTH253wE+AJVilMRGU398X1UQICyT4Tt9AWpeZhwMMViieo7cx8yEFX7ABvErVKFniUQbNx72lsD6+5dLmJ/AVA=
Question
8.58
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Question
8.59
Meta-analysis, mental health treatments, and cultural contexts: A meta-analysis examined studies that compared two types of mental health treatments for ethnic and racial minorities—the standard available treatments and treatments that were adapted to the clients’ cultures (Griner & Smith, 2006). An excerpt from the abstract follows:
Many previous authors have advocated traditional mental health treatments be modified to better match clients’ cultural contexts. Numerous studies evaluating culturally adapted interventions have appeared, and the present study used meta-analytic methodology to summarize these data. Across 76 studies the resulting random effects weighted average effect size was d = .45, indicating a…benefit of culturally adapted interventions (p. 531).
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Question
8.60
Meta-analysis, mental health treatments, and cultural contexts (continued): The research paper on culturally targeted therapy described in Exercise 8.59 reported the following:
Across all 76 studies, the random effects weighted average effect size was d = .45 (SE = .04, p < .0001), with a 95% confidence interval of d = .36 to d = .53. The data consisted of 72 nonzero effect sizes, of which 68 (94%) were positive and 4 (6%) were negative. Effect sizes ranged from d = −48 to d = 2.7 (Griner & Smith, 2006, p. 535).
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