steps to solve and solution. I'm not sure how to approach this question

Heather wanted to know whether there is a significant difference in growth speed of different types of plants. Bunnings had a sale and Heather purchased 30 new plants, of different varieties/types and over the course of the next two months measured the length (in cm) that each plant type grew. Unfortunately. her plants were attacked by spidermites and they all died. Luckily. she had saved some of her data (listed below), however she has forgotten how many different types of plants she purchased. a. She found a significant difference with her one-way ANOVA and used a Bonferroni post hoc test to identify where the differences were b. Adjusted alpha was 0.01 c. The critical t-score (+c) for Bonferroni post hoc was 2.787 Use this information to work backwards to remember how many different types of plants (L.e. the number of groups) she compared for her one-way ANOVA and what the omnibus alpha for the ANOVA would have been. Number of groups/types of plants: Omnibus alpha