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Find the number of days from February 1 to October 1 during a leap year. (See the footnote at the bottom of the table.)
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- define bionomial experiment.also dicus its properties with examplesA cognitive psychologist is interested in the effect that sleep has on daily stress levels. To investigate this, the psychologist recruits 88 participants and splits them equally into either a group that gets less than six hours of sleep each night or a group that gets more than six hours of sleep each night. At the end of each day, participants are asked to report their overall level of stress each day for a month. Those who had fewer than six hours of sleep on average reported stress levels of 6.3 (with most people falling within 1.7 hours of this average). However, those who had more than six hours of sleep reported stress levels of 3.5 (with most people falling within 2.8 hours of this average). Help the psychologist estimate the difference in stress levels based on amount of sleep. What would be the smallest amount of difference in stress in two populations that either got more or less than six hours of sleep? Does this study meet an assumption of HOV? For this study, what kind…A private lake sells boating memberships and currently has 600 members. During the application process the potential members are asked which recreational activity they do the most. Their choices are fishing, skiing, boarding, swimming, or tubing. The lake manager chooses clients according to their interests to maximize the use of all areas of the lake. Every month, the lake rangers randomly sample the boats on the lake and categorize them according to the activity they are doing. The lake manager performs a chi-square goodness-of-fit test using the following null hypothesis to see whether their samples differ significantly from what the original applications claim. H0:pfish=0.26,pski=0.21,pboard=0.30,pswim=0.12,ptube=0.11 In order to meet the conditions for independence and large counts for a chi-square goodness-of-fit test, which of the following represents all possible sizes of the monthly samples? n≥30 lowercase n is greater than or equal to 30 A 30≤n≤50 30 is less than…
- can anyone please explain the solution in part (B)? why does he multiply 2024 sales by (11), 2025 by (12), and 2025 by (13)? why he used 11,12,13 specifically to perform the forcasting for each year? I provided the data that were used in the question in case you need itA student wondered what proportion of a large jar of thousands of marbles were red and speculated that it was 0.30. She took a random sample of 50 marbles and got 18 red marbles, for a sample proportion of 0.36. Below is a dotplot of 100 simulated samples of drawing 50 marbles from a population that is set up to have the proportion of "red marbles" to be 0.30. Based on this dotplot, would getting a sample of 50 marbles to have a 0.36 proportion of red marbles be significant evidence that the true proportion of red marbles in the whole jar is greater than 0.30?One of the most impressive, innovative advances in online fundraising over the past decade is the rise of crowd-funding websites. While features differ from site to site, crowd-funding sites are websites that allow you to set up an online fundraising campaign based around a fundraising page, and accept money directly from that page using the website's own credit card processor. A certain crowd-funding website reported that 132 of 358 technology crowd-funding projects were successfully launched in the past year and 353 of 889 film and video crowd-funding projects were successfully launched in the past year. Calculate the test statistic and p-value.
- Twins, again Afterreading of the JAMAstudy in Exercise 12, alarge city hospitalexamined their records oftwin births for severalyears and found the datasummarized in the tablebelow. Is there evidence that the way the hospital dealswith pregnancies involving twins may have changed?A researcher has access to 100 participants for an independent sample design study, and she is hoping to achieve power = .80.What effect size will her data need to achieve to make that possible?This problem does not require the use of data mining software and focuses on knowledge of concepts and basic calculations. The Boleyn sisters, a pair of entrepreneurs who recently sold their start-up for a multi-million-dollar sum, are looking for alternate investments for their newfound fortune. They are considering an investment in wine, similar to how some people invest in rare coins and fine art. To learn more about the properties of fine wine, they have collected data on 13 different characteristics of 178 wines. They have applied k-means clustering to these data for a range of k values and generated the following table of average silhouette values and elbow chart. k Average Silhouette Value 2 0.259 3 0.285 4 0.260 5 0.231 6 0.194 7 0.206 8 0.197 9 0.156 10 0.202 An elbow chart has a horizontal axis labeled "Number of Clusters" with values from 0 to 11 and a vertical axis labeled "Total Within-Cluster Sum of Squares" with values from 0 to 2,600. The elbow…
- One of the most impressive, innovative advances in online fundraising over the past decade is the rise of crowd-funding websites. While features differ from site to site, crowd-funding sites are websites that allow you to set up an online fundraising campaign based around a fundraising page, and accept money directly from that page using the website's own credit card processor. A certain crowd-funding website reported that 127 of 344 technology crowd-funding projects were successfully launched in the past year and 355 of 890 film and video crowd-funding projects were successfully launched in the past year. Complete parts (a) through (c) below. Part 1 Is there evidence of a significant difference in the proportion of technology crowd-funding projects and film and video crowd-funding projects that were successful? (Use α= 0.01.) a. State the null and alternative hypotheses, where π1 is the population proportion of successful technology crowd-funding projects and π2 is…A credit union takes a sample of four mortgages each month to survey the homeowners’ satisfaction with the credit union’s servicing of their mortgage. Each mortgage is classified as a fixed rate (F) or variable rate (V). a. What are the 16 possible combinations of the four mortgages? Hint: One such possibility would be F1V2V3F4Research has shown that losing even one night’s sleep can have a significant effect on performance ofcomplex tasks such as problem solving (Linde &Bergstroem, 1992). To demonstrate this phenomenon,a sample of n=25 college students was given aproblem-solving task at noon on one day and again atnoon on the following day. The students were notpermitted any sleep between the two tests. For eachstudent, the difference between the first and secondscore was recorded. For this sample, the studentsaveraged MD=4.7 points better on the first test with avariance of s2=64 for the difference scores. a.Do the data indicate a significant change in problem-solving ability? Use a two-tailed test with a= .05. b.Compute an estimated Cohen’s dto measure thesize of the effect