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Z-scores are based on a normal distribution with mean 0 and standard deviation 1.

A study was conducted to examine the effect of reducing screen time before bed on sleep duration among college students. Students followed their usual routine for one week and then reduced their screen time before bed for one week. The difference in hours of sleep (reduced screen time week – usual routine week) was recorded.The sample (n = 400 ) had a mean increase in sleep of 0.8 hours with a standard deviation of 1.2 hours.Construct a 95% confidence interval for the mean difference in hours of sleep.Interpret the confidence interval in words.Is there evidence that reducing screen time before bed is effective? Explain.Would you recommend this intervention based on these results? Why or why not?*Show work to receive full credit. This includes writing the correct formula, plugging in the values, and solving.

(07.01 MC)Researchers in the United Kingdom were interested in the causes of stress in the workplace. Employees were surveyed in 2020, 2021, 2022, and 2023. The reasons respondents reported for feeling stressed in the workplace were tabulated. A sampling of the data collected is presented in the table. Year Workload Lack of Support Insufficient Training Commuting 2020 60% 50% 10% 4% 2021 77% 27% 11% 16% 2022 76% 26% 16% 8% 2023 73% 29% 14% 12% What is the mean for the percentage of respondents who reported lack of support as a contributing factor to workplace stress?

(07.07 MC)A researcher has been investigating the relationship between various treatments and severity of symptoms. The table below reflects the severity of symptoms (rated 1-10, with 10 being the most severe) before and after treatment. Individual therapy Group therapy Family therapy Medication No treatment Before 8 7 8 7 8 After 2 5 4 1 8 What is the mean severity of symptoms after treatment excluding the “no treatment” condition?

(07.06 MC)Study the table. Then answer the question that follows. A B C D Difficulty with reading,spelling, or writing Poor grades Struggle with timed testsor complex tasks Difficulty planning orexecuting actions Clumsiness or slowness intasks requiring movement Repetitive movements Social skills deficiencies Repetitive behaviors Impaired theory of mind Inattention Distractibility Impulsivity Eliana was recently diagnosed with ADHD. Which group of symptoms likely reflects Eliana’s experience?

(07.04 MC)Study the table. Then answer the question that follows. A B C D Intrusive thoughts Flashbacks Difficulty sleeping Detachment from social events Irritability Changes in sleeping and eating behaviors Withdrawn from social activities Rapid heartbeat Chest pains Sweating Avoidance of places that trigger symptoms Irritability Difficulty concentrating Constant worry Socially withdrawn Which group of symptoms most accurately reflects posttraumatic stress disorder?

(07.06 LC)A person who binges on high-calorie foods and then purges a short time later might be diagnosed with which psychological disorder?

(07.06 MC)A client worries that neighbors are tracking her movements from day to day. When they wave at her as she passes, she feels suspicious. She worries they will talk about her while she is gone or go through her garbage to gather information about her. Which personality disorder best fits this profile?

(07.03 MC)Which of the following statements best explains why using an experimental research design may be inappropriate when studying the causes of mental health disorders?

(07.06 MC)Study the table. Then answer the question that follows. A B C D Difficulty with reading,spelling, or writing Poor grades Struggle with timed testsor complex tasks Difficulty planning orexecuting actions Clumsiness or slowness intasks requiring movement Repetitive movements Social skills deficiencies Repetitive behaviors Impaired theory of mind Inattention Distractibility Impulsivity Nikolai was recently diagnosed with autism spectrum disorder. Which group of symptoms likely reflects Nikolai’s experience?