'Psychologists in Montreal and Toronto conducted a study to determine if babies show any preference for speech over general noise ! Fifty infants between the ages of 4-13 months were exposed to both happy-sounding infant speech and a hummed lullaby by the same woman: Interest in each sound was measured by the amount of time the baby looked at the woman while she made noise: The mean difference in looking time was 27.79 more seconds when she was speaking; with a standard deviation of 63.18 seconds: Perform the appropriate test to determine if this is sufficient evidence to conclude that babies prefer actual speaking to humming:'
Added by Courtney C.
Step 1
Null hypothesis (H₀): There is no difference in preference between speech and humming (mean difference = 0). Alternative hypothesis (H₁): There is a difference in preference between speech and humming (mean difference ≠ 0). Show more…
Show all steps
Close
Your feedback will help us improve your experience
Ana Carolina Da Cruz and 100 other Intro Stats / AP Statistics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Infants' listening time. Researchers writing in Analysis of Verbal Behavior (Dec. 2007) reported that the mean listening time of 16 -month-old infants exposed to nonmeaningful monosyllabic words (e.g., "giff," "cham," "gack") is 8 seconds. Set up the null and alternative hypotheses for testing the claim.
Researchers found the influence of background noise on class performance for children. They found that calming music led to better performance on a math task compared to condition A. A researcher selects one class of 18 students who listen to no music. A second class of 18 serves as a control group with no music. The calming music for students in the first class is M = 86.4 with SS 150 compared to an average of M = 78.8 with SS 1204 for students in the second class. Both populations are normally distributed. Use α = 0.05. Is there a significant difference between the two music conditions?
Sri K.
Recommended Textbooks
Elementary Statistics a Step by Step Approach
The Practice of Statistics for AP
Introductory Statistics
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD