Solucions als problemes de https://rpubs.com/perelopez/problemes_teo_CNED

Problemes complementaris als del metacurs

Analisis ini bertujuan untuk mengeksplorasi hubungan antar variabel numerik pada dataset diamonds melalui pendekatan visualisasi data kontinu bivariat. Visualisasi digunakan sebagai langkah eksplorasi awal untuk memahami pola hubungan sebelum melakukan analisis statistik lanjutan. Melalui scatter plot dan variasinya, setiap observasi direpresentasikan sebagai pasangan nilai dua variabel, sehingga memungkinkan identifikasi pola hubungan, kekuatan asosiasi, serta keberadaan outlier dalam data.

HRS转型

India in comparison to world.

HRS 转型

A university wants to know if a six-week physical activity program improves student stress levels. Students complete a standardized stress questionnaire (multiple item rating scale) one week before the program begins and again immediately after the program ends. The goal of the study is to determine whether stress levels change after participation in the exercise program. Conduct the appropriate statistical test to determine whether there is a significant change in stress levels from before to after the program

A university wants to know if a four-week mindfulness training program reduces student stress levels. Students complete a standardized stress questionnaire (multiple item rating scale) one week before the program begins and again immediately after the program ends. The goal of the study is to determine whether stress levels change after participation in the mindfulness program. Conduct the appropriate statistical test to determine whether there is a significant change in stress levels from before to after the program.

A university wants to know if there is a difference in weekly study hours between undergraduate students who work part-time jobs and those who do not work. Students report the number of hours they studied during the previous week. The goal of the study is to determine whether weekly study time differs between working and non-working students. Conduct the appropriate statistical test to evaluate whether the two groups differ in study hours.